The power gained from installing a downpipe can vary depending on your specific car, variances in dyno measurements, and other factors, but any way you look at it, this is one of the biggest single power adders. I wanted to share how well the borla catback exhaust compliments the boxer engine and since I couldnt find any videos that were. With California 91 octane fuel, you may see gains of up to 40hp with an e-tune. This depends heavily on the octane rating of the fuel used. Install the COBB 3' SS Cat-back Exhaust on your WRX/STI and experience performance like no other. The COBB 3' SS Cat-back Exhaust for the 2015+ Subaru WRX/STI is a triumph in design and execution. Tuners are reporting gains of up to 55 hp with 93-94 octane fuel with an aftermarket j-pipe. Perfect fitment is achieved with either the Subaru factory downpipe or the COBB 3' SS Downpipe. A downpipe is required for a stage 2 tune and will really bring your car to life. We've compared them to help you make your decision easier. We've compiled a list of the best, whether you want to go catless or catted, sticking with a high flow catalytic converter. With so many on the market, it can be hard to know which one to choose. Disclosure: When you click links to the various merchants on this site, we may earn a commission if you make a purchase.įor the 2015-2020 Subaru WRX, an aftermarket downpipe (otherwise known as a j-pipe) is one of the most substantial horsepower adding modifications you can do.
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