Subaru WRX Forum banner

1 - 1 of 1 Posts

·
Registered
Joined
·
3 Posts
Discussion Starter #1 (Edited)
Thinking about installing a magnaflow axle back exhaust! Will the car need to be tuned or will the stock tune work?
Will it increase the horsepower and fuel mileage, with less back pressure?
 
1 - 1 of 1 Posts
Top