Help w/American Thunder 40 Series Exhaust

[The Deuce]

Originally Posted by IBleedBlue

Orange97GTVert, let me know how that sounds after you get an X-pipe. I have an 03 Mach1, catted X-pipe, 40 series flows welded into stock cat backs. I want to decrease the interior noise without performance loss. I think I'm going to try the 50 series flows instead.
Do you think it will make a difference with interior noise with this set up?

Mufflers won't affect your power. Especially Flows. The only one's I've credibly seen improvement with are Magnaflows. It's because they are straight through, not chambered.