COBB Brings Speed Density to 2.0L Turbo Subarus

COBB Tuning is proud to announce the immediate availability of our proprietary Speed Density (SD) tuning solution for all currently-supported 2.0L USDM turbocharged Subaru vehicles with manual transmissions! This capability is available as a free update to our AccessTUNER Pro and AccessTUNER Race software and AccessPORT firmware. Our implementation of Speed Density adds our proprietary tuning logic to the factory ECU, enabling it to calculate load, ignition and fueling requirements using the engine’s manifold absolute pressure (MAP) sensor, instead of the factory mass airflow (MAF) sensor. COBB Tuning’s exclusive Realtime tuning capabilities and Hybrid Logic (active switching between MAP and MAF based logic) make this a uniquely powerful and flexible engine management solution. Read on for more details about the work COBB Tuning is doing to make sure the AccessPORT is the most comprehensive OEM ECU tuning solution available for Subaru performance enthusiasts.

Why Speed Density
The most basic function of an engine control unit (ECU) is to measure airflow and its translation to engine load. Precise and consistent load calculations along with feedback from other critical sensors allow the ECU to accurately control ignition timing, variable camshafts, and fuel delivery. The most common way to measure load in modern vehicles is with a MAF sensor. Vehicles with stock engines and mild upgrades can utilize the MAF sensor with excellent overall results. However, in big-build and motorsports applications where power levels are extremely high and intake airflow configurations are less standardized, the use of a MAF sensor can be limiting.

Speed Density tuning using the Subaru factory ECU is a major break-through for high-power Subaru builds. High-power builds using the OEM MAF sensor require very large MAF intake housings to keep the MAF sensor within its usable range, which introduces reduced resolution and unpredictable turbulence that can affect tunability and drivability. Eliminating the need for a very large, high-quality MAF intake housing using Speed Density tuning logic allows for more flexibility when designing a turbo kit and the associated piping and plumbing. Speed Density tuning gives precise control over fueling, timing and other critical tuning components necessary to properly calibrate the vehicle at the very high power levels that today’s big Subaru builds are capable of producing.


Hybrid Logic – Ultimate Flexibility
The Speed Density update for AccessTUNER Pro software offers multiple ECU control modes to give the professional tuner and AccessPORT user a wider choice of engine modifications and tuning options. The software can program the ECU to run in the traditional pure MAF mode, a pure “Speed Density” mode, or a Hybrid Mode which uses both MAF and “Speed Density” with dynamic logic switching between the two.

Tuning Efficiency
COBB’s proprietary Speed Density implementation overcomes many of the limitations and tuning difficulties inherent to the Subaru 2.0L ECU. No longer is there a need to employ hacks to artificially raise the airflow and load limits present in the factory 2.0L ECU. These limits have been internally raised for COBB 2.0L Speed Density, allowing you to simply tune with real-world airflow values (up to 655 g/s) and load values (up to 10.0 g/rev). Additionally, in SD (Speed Density) mode, only the new load limit will come into play, allowing for the accommodation of very high horsepower builds.

We have also made improvements to boost control with 2.0L Speed Density. It is no longer necessary to move away from factory ECU boost control at higher boost levels. New internal changes allow targeting up to 49 psig of boost. We have also incorporated all-new per gear boost targets and wastegate duty compensations, allowing for more precise control of boost in each gear. These new per gear compensations are also compatible with 6-speed transmission swaps, allowing for individual manipulation of boost control in each of the 6 gears.

Tuning aftermarket injectors with COBB 2.0L Speed Density could not be easier. The “Fuel Injector Scale”, “Fuel Injector Latency”, and “Tip-in Enrichment” tables can now be tuned via real-time with COBB 2.0L Speed Density, enabling you to quickly dial in your injector tune. An all-new real-time “Fuel Injector Latency Adder” table allows for tweaking of idle and low load behavior for large aftermarket injectors, resulting in more refined operation during these conditions.

Tuning for aftermarket MAP and IAT sensors is also improved with COBB 2.0L Speed Density. Changes have been made to allow for the full calibration necessary to tune for any Subaru compatible aftermarket MAP and IAT sensors.

Proven Performance
COBB Tuning’s Speed Density for Subarus has already proven capable of tuning big-power Subaru engines. The LIC Motorsports 2004 Subaru STI Time Attack race car claimed the Modified AWD class victory and set a new Modified AWD class record at the Infineon Raceway Global Time Attack 2011 season finale using the AccessPORT and Speed Density tuning. More information about this performance and in-car action can be seen HERE.


Speed Density Availability
This initial release of Speed Density is available for professional tuning shops using AccessTUNER Pro software and for self-tuners using AccessTUNER Race software for the 2002-2005 Subaru WRX.. “Off-The-Shelf” maps will not be made available for Speed Density as custom calibration specific to each vehicle is required.

To have your vehicle tuned using Speed Density logic, simply follow these steps:

  • Contact your preferred Pro TUNER, confirm they have the latest 2.0L Speed Density enabled AccessTUNER Pro software ( and schedule a Speed Density dyno-tune appointment with them
  • Update your AccessTUNER Race software to the latest version ( to acquire 2.0L Speed Density functionality.
  • Update your AccessPORT firmware to version (or later) prior to your scheduled tuning appointment. To update your firmware follow this Step-By-Step AccessPORT Firmware Update Tutorial.
  • Download the Subaru 2.0L Speed Density Tuning Guide and read to fully understand this 2.0L Speed Density implementation.

As always, if you have any questions about the AccessPORT and AccessTUNER, or any other COBB Tuning products, please call us at 866-922-3059. Get up-to-date product announcements and COBB Tuning news via our COBB Tuning Mailing List. You can always be a part of the latest conversations with COBB Tuning by tuning in to our our and pages.

COBB License Plate Delete Kits for Subaru

COBB Tuning is pleased to announce the immediate availability of the COBB License Plate Delete Kit for Subaru vehicles. The COBB License Plate Delete keeps the front of your Subaru looking clean and sleek, while letting others know that you choose the highest quality performance parts in the industry. This license plate delete is CNC machined from 6061 aluminum billet bar stock. It is then black hard anodized for a sleek and durable finish that complements any color scheme. The license plate delete kit is finished with the COBB logo CNC machined into the face and includes countersunk stainless steel hardware to give the kit a slim profile and refined appearance.

Part Number: 812060 Part Number: 812050
Retail Price: $55.00 Retail Price: $55.00
Applications: 06-12 WRX Applications: 02-05 WRX
06-12 STI 04-05 STI
05-09 Legacy GT
06-09 Legacy GT SpecB
05-07 Outback XT

The COBB License Plate Delete Kit for Subaru is available with free shipping at or immediate pick-up at the following retail stores: COBB Tuning Plano (Plano, TX), COBB Tuning SoCal (Fountain Valley, CA), and COBB Tuning Surgeline (Portland, OR).

MotoIQ Visits COBB SoCal for Project GD STI

After MotoIQ finished making their GD Subaru STI a corner carver, they knew it was time to add power. So they took it to the experts at COBB Tuning SoCal for a catback exhaust and a custom tune from COBB SoCal’s new calibrator Mitch McKee. MotoIQ not only got some surprising power gains, by a nice tour of COBB SoCal’s professional dyno cell. Read their article below and then check out for more information on performance parts and the AccessPORT.

COBB Tuning AccessPORT Featured on Two Guys Garage

Check out the latest episode of Two Guys Garage on SPEED to see Kevin and Willie install the COBB Tuning AccessPORT on a 2006 Subaru STI. A special thanks goes out to Motovicity for getting these guys the ultimate tuning solution. Watch the video below and then visit to learn more about the AccessPORT and what the power gains you could be seeing.

COBB Adjustable Internal Wastegate Bracket

COBB Tuning is proud to announce the availability of an innovative new pair of Internal Wastegate (IWG) Brackets for Subaru and MAZDASPEED vehicles in short and long bracket styles. The COBB Tuning Adjustable IWG Bracket is the first of its kind, and the most versatile and reliable way to keep a turbocharger’s internal wastegate closed when using an external wastegate setup. The Adjustable IWG Bracket can be installed quickly, adjusted for perfect fitment on many different turbos, and can be removed just as easily to return a turbo to its original configuration.

The COBB Adjustable IWG Bracket replaces the internal wastegate actuator and locks the wastegate in a fully closed position. This is a superior solution to welding the wastegate door closed, which is a time-consuming, expensive and irreversible process. The COBB Adjustable IWG Bracket is easy to install and bolts into place and adjusts quickly using simple hand tools.

Not all turbos are made exactly the same, and there can be variations in housings, center cartridges, clocking, etc. A single position internal wastegate bracket may not accommodate these variations and fail to close the wastegate completely, which will result in poor turbo response and lower maximum boost. The COBB Adjustable IWG Bracket takes the worry of turbo-component variance out of the equation and allows proper adjustment, every time, on a variety of different turbos that a non-adjustable internal wastegate bracket simply cannot match.

The COBB Adjustable IWG Bracket’s advantage lies in its unique adjustable rod-end linkage. The turnbuckle center section features right-hand and left-hand threads to make adjustment as easy as rotating it one direction or the other to shorten or lengthen it. The rod-end linkage and through-bolt allow high misalignment for maximum adjustability. The bracket itself is made from a single piece of 11-Gauge steel and incorporates slotted bolt holes for additional adjustability and turbo compatibility. The custom spade-bolt that connects to the wastegate arm, the bracket, and the turnbuckle are black zinc coated for an attractive finish that is corrosion resistant. All hardware for install is included in this kit.

The COBB Tuning Adjustable IWG Bracket offers maximum turbo compatibility, simple installation and is easily adjustable to ensure complete wastegate closure to get the maximum performance from your specific setup. In the familiar words of our dads, “Make sure you shut the damned door!”

Part #: 512273 and 512274
MSRP: $39.00
Vehicle Applications:
This is a preliminary list. Additional applications will be listed as confirmed
Part # Make Model Years
512274 Subaru STI 2008-2012
512273 Subaru STI 2004-2007
512273 Subaru WRX 2009-2012
512274 Subaru WRX 2002-2008
512274 Subaru 2.5GT 2010-2011
512273 Subaru Forester XT 2004-2007
512273 Mazda MAZDASPEED3 2007-2012
512273 Mazda MAZDASPEED6 2006-2007
512273 Mazda Mazda3 MPS 2007-2011
512273 Mazda Mazda6 MPS 2004-2006
Turbo Applications
This is a preliminary list. Additional applications will be listed as confirmed
Part # Manufacturer Model
512273 APS SR20
512273 Blouch 20g, 20g-XT, 20g-XTR
512273 Blouch Dominator 1.5, Dominator 3.0R
512273 BorgWarner K04
512273 Forced Performance Old FP Green
512273 Garrett All T25 flanged internally gated turbos
512273 IHI VF39, VF43
512274 IHI VF39, VF43
512273 18G
512273 Mitsubishi TD04

NASIOC Top Scoob 029: Matt Kincaid’s 9 Second WRX

Top Scoob is an occasional themed contest on NASIOC Forum where users vote for their favorite cars. NASIOC’s Top Scoob 029 for Christmas and the Quarter Mile saw several very fast and great looking Subarus competing for the top spot. When the dust settled, Matt Kincaid’s 9 second bugeye WRX finished on top, just like it does at most events in the Pacific North West. Matt bought the car brand new in 2001 and reached his first goal of a 10 second pass in full street trim by 2009. With help from COBB Tuning Surgeline, the car was prepped for a season full of 9 second passes in 2011. For 2012 and beyond, Matt hopes to reach 8 second 1/4 mile times with help from his sponsors: COBB Tuning Surgeline, Advanced Clutch Technology, DCCDPro, Pacific Import Auto, T-Mac Performance, Extreme Turbo Systems, and Thunder Bolt Racing Fuels. Read more details about the car on NASIOC and check out what COBB Tuning Surgeline is up to on Facebook.

COBB Tuning MAF Block-Off Plates

The COBB Tuning MAF Block-Off Plate Kit is the perfect complement to Speed Density tuning. Speed Density tuned vehicles use a Manifold Absolute Pressure (MAP) sensor to monitor the mass of ingested air instead of the OEM Mass Airflow (MAF) sensors, which means the MAF sensors can be removed from the intake tubes. Removing the MAF sensors eliminates points of restriction and turbulence in the intake tract, but can present additional issues if not done properly. The COBB Tuning MAF Block-Off Plates are the easiest way to safely delete the MAF sensors for optimal performance and enhanced engine bay appearance.

We start with billet 6061 T6 aluminum and CNC-machine a plate/plug to seal off the openings left when the MAF sensors are removed. The plug has two unique features that are key to reliable performance. The first is an O-ring that tightly seals the Block-Off Plate to the MAF sensor opening, preventing unfiltered air from entering the intake tract. The second feature is the shape of the plug face, which is sculpted to exactly match the inside curve of the MAF tube. When seated, the plug completey fills the MAF sensor opening and the face sits flush with the inside of the MAF tube. This provides smooth, uninterrupted walls that prevent turbulence.

The COBB MAF Block-Off Plates are hard anodized in black for a durable, corrosion resistant finish. The Block-Off Plates then go back on the CNC mill for a final pass to have the COBB logo machined into their top faces. The kits are finished off with stainless steel button-head screws and black nylon washers that give the plates a professional appearance when installed. The COBB MAF Block-Off Plate Kits work with stock intakes, COBB SF Intakes, and any direct replacement intake with an inner diameter similar to stock.

Part Number: 712070
MSRP: $45.00
Subaru WRX 02-07
Subaru STI 04-07
Subaru Legacy GT 05-09
Subaru Legacy GT SpecB 06-09
Subaru Outback XT 05-09
Subaru Forester XT 04-08
Part Number: 715070
MSRP: $45.00
Subaru WRX 08-12
Subaru STI 08-12
Subaru Legacy GT 10-12
Subaru 2.5GT 09-10
Subaru Forester XT 09-12
Part Number: 7C1070
MSRP: $90.00
Nissan GT-R 08-12

COBB Tuning 3-Port Boost Control Solenoid

COBB Tuning is proud to announce the immediate availability of the COBB Tuning 3-Port Boost Control Solenoid (BCS) for turbocharged Subaru, Mazda and Mitsubishi applications. The COBB 3-Port Boost Solenoid is an excellent upgrade for modern turbocharged vehicles, enabling precise boost control in a tidy package that is easy to install and tune. Our BCS will eliminate boost fluctuations and boost creep inherent in OEM boost control systems, providing the necessary stable and repeatable boost control required for accurate tuning and consistent performance. The COBB BCS is equally capable of providing stable boost control at stock boost levels as well as extremely high boost levels associated with big-power builds, with an operating range of up to 120psi.

The COBB Tuning 3-Port BCS features 1/8″ low-profile barb fittings to keep the unit compact, and are nickel coated for corrosion resistance. Optional 1/4″ nickel plated fittings are also available separately. Viton spools and seals are used throughout for long life and lubricated with Dow Corning silicone grease. The manual override port is sealed with an O-ring, the wiring harness is sealed to the casing using a waterproof grommet and the solenoid wires are ultrasonically welded to the coil, making the device waterproof and safe to wash.

COBB Tuning has made the COBB 3-Port BCS installation as simple as possible. It mounts in the stock location and plugs directly into the stock wiring harness, making the physical install and electrical connection as straightforward possible. The BCS comes with a custom aluminum mounting bracket, stainless steel hardware, the necessary boost-line to complete all connections and zip-ties to route the boost-line neatly through the engine bay. The install instructions are easy to understand, with photographs and illustrations to guide you through the installation process, and include routing instructions for both internal and external wastegate configurations.

The COBB Tuning 3-Port BCS is the ulimate electronic boost control device for modern turbocharged applications, designed for outstanding boost control, engineered for consistent performance over an extended service life, and configured for easy installation. Get your boost under control and Access the Potential of your turbocharged Subaru, Mazda or Mitsubishi today!

Click the part number below to visit the product page on

PN: 712750 PN: 715750 PN: 771750 PN: 752750
MSRP: $115.00 MSRP: $115.00 MSRP: $115.00 MSRP: $115.00
Applications Applications Applications Applications
- STI 04-07 - STI Hatch 08-12 - MS3 07-12 - EVO X 08-12
- WRX 02-07 - STI Sedan 11-12 - MS6 06-07 - Ralliart 09-12
- FXT 04-08 - WRX 08-12 - MPS3 07-11
- LGT 05-09 - MPS6 04-06
- LGT SpecB 06-09
- OXT 05-09

COBB AccessPORT Support for 2012 Subaru Legacy GT

COBB Tuning is proud to announce that the ultimate tuning solution for turbocharged Subaru vehicles, the AccessPORT, is now available for the USDM 2012 Subaru Legacy GT. Only the AccessPORT can let you add tire shredding power gains from the comfort of your driver’s seat with just the push of a button.

The AccessPORT is the only tuning solution that offers this level of simplicity, with unmatched control of the Subaru engine computer (ECU). Tuning the Legacy GT is as easy, or as involved, as you want it to be. The AccessPORT’s selection of Off-The-Shelf maps lets you reprogram the ECU for more power and torque with push-button ease. Experienced do-it-yourself tuners prefer to self-tune for free using our sophisticated AccessTUNER Race software with real-time tuning capability and the option of using Speed Density tuning logic for big power builds. Those seeking maximum power gains take advantage of professional dyno tuning services that are available through our network of COBB Professional Tuners.

While huge push-button power gains are impressive on their own, it is just the start of the AccessPORT’s capabilities. The AccessPORT is the multi-tool of the Subaru performance enthusiast. See how your 0-60 mph and ¼ mile times improve using the AccessPORT’s Performance Mode. Enhance your Legacy GT’s gauges by using the AccessPORT to display Live Data directly from the ECU. Record your driving session by data logging over 100 engine monitors for up to 10 hours. Get the perfect launch off the line and lowest 1/4 mile ET using the AccessPORT’s adjustable Launch Control and Flat Foot Shift settings. Avoid trips to the dealership by using the built in trouble code scanning and clearing functionality. And if you ever need to remove the AccessPORT, the uninstall process is just as simple, taking mere minutes to restore the ECU to its original condition.

The Subaru Legacy GT was built to go fast. The COBB AccessPORT gets you going even faster, with hassle-free simplicity, convenient portability and proven reliability. You don’t have to be a rocket scientist to turn your Subaru into a rocket ship. Access the Potential of your 2012 Legacy GT today!

New 2005-2006 Legacy GT and Outback XT SF Intake Maps Now Available

COBB Tuning SF Intake calibrations are now available for your 2005-2006 Legacy GT and Outback XT! The new Stage 1+SF or Stage 2+SF maps can be downloaded from the Off-The-Shelf Map Database for your specific model year and octane level. Then you can easily transfer them to your AccessPORT using AP Manager and Reflash your car in only a few minutes. These new maps utilize a custom MAF calibration to get the full performance out of the COBB Tuning SF intake for your manual or automatic transmission Legacy GT or Outback XT. As always, if you have any questions, please call us at 866-922-3059 or email