How to install an STi Downpipe
Adding an aftermarket downpipe to a Subaru WRX STi is one of the EASIEST ways to increase STi horsepower and torque.!
The stock is very restrictive! By removing the super restrictive stock downpipe, you can easily increase the horsepower, torque and throttle response… Noticeable power gains too! I’m talking you notice the difference before and after!!! Like Whoa!
Check out the video below to see how to install an STi downpipe
PS — If you want to make serious power in your sti, you will also want to add a cat-back exhaust while you are upgrading your downpipe