Going To make a Change

The don’t care what the F.A.S.T guys do!
1: There not driving the street all the time.
2: Even if they are, I bet that there actual “Fast” car has headers.
3: Running exhaust manifolds is a serious HP loss.
Sorry, I meant to say it is a MAJOR loss.
A lot more than 20hp!

A 2-1/2 sized exhaust system is good for the street in most cases for a good balance between quietness & power.

The X pipe is the smoothest sounding.
The H pipe is a little louder and gives that muscle car chop rhythm.
Power wise they should be considered equal.