Well the muffler I plan on using is the 6" round race series
model. It says here
http://www.magnaflow.com/02product/racing.htmthat the inlet/outlet is 3.5 at the least...I know these can work with a 2.5 exhaust cause i have seen it on a 2.5 system. Here
http://www.cardomain.com/memberpage/476654...so i know it is possible. i would jus like to know how...thanks for the input guys...
Kevin