GT Owners with Heffner exhaust


BlackICE

GT Owner
Nov 2, 2005
1,416
SF Bay Area in California
DBK, how would you quantify the difference in noise level? Would you say for example, it is 20% quieter at 5000 rpm, and 10% at idle.

I am trying to decide if I should give them a try too. But if it is only a 5% perceived difference to people it isn't worth the trouble to take it apart again. I just got it reinstalled with the cat delete pipes an hopefully will fire it off tomorrow.