i plan on doing a mach up with steel tubing but when i fab up the real exaust should i use Stainless pipe or stainless tubing? do i have to have a pre muffler? (pros and cons). how much of a difference does the pre muffler make?

thanks
ben

 

Year/model?

 

not sure of the year. (crap) i do know it is an s4 engine with a s5 turbo.

 

Stainless TUBING is more common. Pipe and tubing are measured differently. Pipe is measured by ID, tubing is by OD. So a tubing bender won't do well on pipe and vice versa.

Without question you will want a resonator. It will cut the sound down to tolerable levels. If you just run a straight pipe and two rear mufflers, the car will be obnoxious.