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performance
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Welcome to the Flatirons Tuning Website
Flatirons Tuning is a division of Flatirons Acura and Subaru in Boulder, Colorado. We specialize in top quality performance parts for Honda, Acura and Subaru, for both street and race applications. We are dealers for many top aftermarket brands including Cobb Tuning, Comptech, BPM, Spoon Sports, Cusco, Enkei Race Wheels, Perrin, STI, SPT, Prodrive, Brembo, Tein, Exedy, Blitz, Go Fast Bits, and Red Line.
Our goal is to provide excellent customer service while being your source for all your Acura and Subaru performance needs.
Stay tuned for updates on the Flatirons Tuning Rally team currently competing in the 2008 Rally America Championship series.
Check out highlights from last years event's: CLICK HERE |

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New Pricing! In STOCK and ready to ship TODAY!
We now offer Free Over-Night Shipping on all Access Ports!
The AccessPort allows you to re-flash the programming on your vehicles ECU to that of your specifications. You can adhere to pre-set maps designed by Cobb for different levels of modification on your vehicle, or have your dyno-tuner build you a custom map or maps which you can switch at your will by following simple instructions included with the unit, and plugging the AP into the OBDII port. Once completed, you can put the accessport in your glove box, or even in your closet!
The crowning function of the AccessPORT is COBB's unique 'Real-Time' mapping, which allows you to change the tuning data within seconds, as opposed to minutes. Simply park, switch real-time, and resume driving, it's literally that easy.
Using Cobb’s off-the-shelf staged maps, the AccessPORT can unlock the potential of your vehicle by as much as 50hp, and more based on further modifications. The possibilities are endless since the AccessPORT is a short ProTUNE away from giving your car even more potential from the staged maps.
The AccessPORT's features include:
» On-the-fly map switching
» Monitor vehicle sensor data and display in analog or digital format » Vibrant color graphic display with First-Ever full 260,000 color OLED, high-resolution screen » Read/Clear engine trouble codes » Preloaded with performance, economy and convenience maps » Update via the Internet » Measure 0-60 and ¼ mile times » Adjustable on-screen Shift Light functionality » Estimates horsepower and torque » Displays current and averaged fuel economy » Drag race simulation with reaction time and “time slip” data » Built in on-screen help mode function
» Custom performance tuning for your specific vehicle and modifications as provided by an authorized AccessPORT ProTUNER™ center, or upgrade to the StreetTUNER™ software package for do-it-yourself tuning
Regular Price: $695.00 On Sale For: $595.00
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In stock and ready to ship. If you place your order before 2:00 Mountain Time, we will ship your order out the same day.
The SPT high flow intake is constructed of 319 diecast aluminum, and is manufactured to ensure the smoothest high flowing bends. Each system includes a silicone reinforced boot, anti-vibration mounting system, stainless steel t-bolt clamps, and a SPT 4-layer cotton gauze filter with a built-in velocity stack for smooth air flow.
The Engineers at Subaru have done all this to ensure that the SPT intake system will work with the stock MAF, and will not throw any check engine lights or require special tuning to function properly.
Also available is the SPT Heat Shield which helps ensure that the SPT Intake is able to supply the engine with cool air, which reduces the loss of power that comes from a heated intake charge. Cooler air is drawn from inside the passenger front wheel well, and behind the headlight – not from the hotter areas surrounding the turbocharger, engine, and radiator.
Unlike a traditional cold-air intake, which places the filter element as low as possible in the vehicle, this setup helps to supply cool air by surrounding the intake with a large plastic wall that acts as a barrier between the intake and the engine bay heat while also limiting the risks of water ingestion.
Regular Price: $299.90 On Sale For: $249.99
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In Stock and Ready to SHIP!
We just got in a couple of these blocks from Subaru at a special price, so we can pass that on to our customers. This price is only available on a very limited number of blocks, and is only good while suplies last.
This is still the same brand new Subaru OEM block as before, just at a lower price!
This is a brand new, completely assembled short-block directly from Subaru.
This is where to start if you are building a hybrid engine with your 2.0 liter heads on a 2.5 liter block. Or maybe you just need to give your engine a new lease on life. This comes with the block, crank, pistons, and rods completely assembled, and ready to bold your heads on.
Complete engine is pictured, this is only a short-block, and does not include the intercooler, intake manifold, etc.
If you are putting this block in a car that it was not originally designed for, it carries no warranty expressed or implied.
This part has recently superseeded. The old Subaru Part # was 10103AB4409L. The New Subaru Part # is 10103AB910.
Regular Price: $2,063.57 On Sale For: $1,700.00
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We Now Offer Free Shipping On All COBB Parts!!!!!!!!!!
Starting with the basics, Cobb's downpipe replaces the two factory catalytic converters located directly after the turbocharger. These parts are commonly called the downpipe and 3rd cat or mid-pipe cat. Cobb's downpipe has been specifically designed for an OEM-like fit and will bolt directly to the COBB Cat-Back, the factory cat-back, or any aftermarket system designed to bolt to the factory catalytic converter.
It should also be noted that this system may not be legal for street use in some states, which is the case with ANY aftermarket exhaust that replaces ANY emissions equipment.
Cobb's downpipe is built as one complete unit and is comprised of 4 major design elements; a precision Investment-Cast 304 SS Turbo Outlet Housing, 3" 304 SS Mandrel Bent Piping, an optional SS Metallic Substrate Catalytic Converter, and a laser-cut 304 SS OEM style flange with integrated flex.
Through the use of a high quality Stainless Steel 304 casting, Cobb is able to provide a part that not only has the proper internal shape necessary for optimal performance and turbo response but also provide an extremely durable unit. Another advantage to this design is the reduction in exhaust noise entering the passenger cabin. When metal is stretched and pulled to create the bellmouth shape, it actually reduces the wall thickness of the metal. This in turn produces a "tin-ny" sound that can easily be heard in the cabin. Cobb's thick wall casting does not suffer from this problem. Furthermore, the thicker stainless steel casting helps keep more heat in the exhaust which reduces underhood temps and improves performance by maintaining high exhaust gas energy as it leaves the turbocharger.
This system replaces both the stock downpipe section and final catalytic converter section. They will mate up perfectly to the stock or any aftermarket cat-back system designed to attach to the factory donut style flex gasket. A bung necessary to use the second factory O2 sensor is included. In addition, an auxillary O2 sensor bung is located near the turbo in a position that's easy-to-reach from the engine compartment for wide-band O2 sensor use during tuning sessions.
Cobb uses state-of-the-art metallic substrate catalytic converters in their catted down pipes. These metal substrate cats are designed for optimal durability and flow so well, they pose virtually no HP reduction on most street cars. The high-flow catalytic converter is included in the STREET version.
All flanges, hangers, O2 sensor bungs, casting and piping are constructed 100% from 304SS. TIG welding used exclusively.
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This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin. Suited best for 2002+ Subaru models.
Regular Price: $11.50 On Sale For: $10.50
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