This has probably gone over several times. but my search results are not what answer im looking for.
so im going with 3.5in down pipe to two mufflers, one as a mid pipe and the other as a muffler.
Now should i use the the 20'' magnaflow race series canister as a mid pipe and the 12'' race series canister as a muffler. Or use the smaller one for a mid pipe and the larger one for a muffler?
or I was thinking about using a magnaflow canister as a mid pipe and a Aero muffler and the end.

 

I've got the larger one in the mid, and the canister at the end.

The second one did trim a few lbs off my boost tho.

 

i run 2 20" long 4" inlet/outlet mufflers. ground clearance kinda crappy in the middle... but my mounting job wasnt that great.