![]() The increase of 3-psi of boost accounts for roughly 20 whp of the power increase, while the remaining 11 horsepower gain can be attributed to the reduction in backpressure. This shows the effect that exhaust restriction has on this particular vehicle, and how it bottlenecks output and boost pressure. With 25.75-psi boost pressure, peak power and torque increased by 31.07 horsepower and 27.3 lb-ft, respectively. The benefits of the massive 3.5-inch stainless-steel piping became immediately apparent, as the reduction in exhaust backpressure resulted in substantial gains on the dyno. Test 2: ARK Design Superflow Dual Exit Exhaust The Stage-1 ACN91 map yielded an extra 7.21 peak horsepower and an incremental gain of 9.9 horsepower and 11 lb-ft torque. The Cobb Tuning Accessport can flash the factory ECU with any of the different tuning maps that can be downloaded from the Cobb Tuning website. The only factory hardware you’ll reuse is the two 17mm bolts that mate the catalytic converter to the exhaust. ![]() The exhaust includes all the necessary hardware for installation, including new gaskets, nuts and bolts. A little spritz of WD40 or any other spray lubricant on the exhaust hangers and the bolts holding the exhaust together helps to expedite the disassembly and removal of the stock system. The stainless steel ARK Design Superflow Dual Exit exhaust installed quickly and easily, taking a mere 30-45 minutes to install, once the factory exhaust cooled down enough to be handled. Since the Cobb Stage-1 ACN91 map accommodated either a stock or aftermarket exhaust, we installed the ARK Design exhaust next.
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