iggster
15+ Year Contributor
- 30
- 0
- Feb 1, 2005
-
Janesville,
Wisconsin
Ok all. Here is the scenario. I just recently replaced my entire exhaust sustem with new stock exhaust parts. Yesterday I went and picked up a hiflow cat. IF I use this in place of the stock cat keeping the stock muffler on will I still see performance gains or should I now replace the stock muffler as well?