I always thought that the cobras had 2 1/2 inch midpipe... Well I measured it and it was only 2 1/4.. will going to 2 1/2 make a huge difference for my setup?
An o/r mid-pipe is proven to add some nice gains. I went from a 15.2 @ 92 mph to a 14.8 @ 95 mph with an o/r h-pipe and pulleys. So it's probably good for at least two tenths. All stock mid-pipes are 2.25" and aftermarkets are 2.5" Good luck
Agree with above...if you open up one side or the other, but not both, you still have the restrictions there, although the sound is probably gonna be better.
RC