Originally Posted by Eklypse39
since you have a 6th gen, all you need is the " Y " pipe from a V6 model and 2 cans.
if you're going dual on an i4, you'll be losing large amounts of back pressure which will actually make your car slower.
pay no attention to back pressure...exhaust velocity, that's where it's at...
on a side note...no back pressure, very good for me...