I have a muffler question, I was looking at the flowmaster site for flowmaster 40's and they have a few different types, they have 1 in 1 out, 1 in 2 out, 2 in 1 out and 2 in 2 out and some of them enter from the middle and sides of the muffler and exit different positions to. what is the difference with these? before all I had seen was in from the cat out to the tailpipe, is there any type of flow difference in them?

here is a link to the page:
http://www.flowmastermufflers.com/40_super.html

 

uh i think u want the 1 in 1 out, but i know u need the offset in offset out, cuz of the way our undersides are setup.