I've got stock headers, 2 cat bbk xpipe, and an american thunder catback (2 chamber delta flows). It's a little quieter than I expected, I'd toss my pipes but I kind of like the look, not to mention I just paid for them. Anybody have 1 chamber flows with pipes? Is it pretty loud? I don't care if the car drones. I miss the sound of my stock h-pipe with the flows dumped at lower rpms.