Im wondering why ......
* the narrowing to 3",
* the turn to up and over the axle,
* and the muffler.
In my situation it adds power. About .07 in ET and 1 mph on back to back runs at the track.
Here:
http://www.stainlessworks.net/GM%20N...leflow_Exhaust
Halfway through is a picture of the 3-1/2" muscleflow exhaust system.
I originally had a baffled muffler and wanted louder so we ended up with a straight through muffler. After that, rasp was so horrendous at 2000rpm-2500rpm, we put bullets in the y-pipe ( small, like maybe 10" ) where the cats normally go and it eliminated all rasp and droning.





