I have 2 chamber Delta on my mach1 with shorties and OR-X, and i love it. It doesn't drone very bad, and sounds good but not obnoxious..... then get above 3500rpm and it sounds like a monster!
P.S The deltas are the quieter of the 2 but are supposed to flow just as well if not better for the late-model crowd.
I have Flow 40s and a MAC o/r H, love the sound. Loud when you get on it, quite idle. FYI I had a SLP LM1 Catback installed and couldn't stand it. I didn't want to go back to my stock mid so I had the flows welded in
If you are considering an exhaust change from your MAC mufflers go with the 40s, you wont regret it.
I have Flow 40s and a MAC o/r H, love the sound. Loud when you get on it, quite idle. FYI I had a SLP LM1 Catback installed and couldn't stand it. I didn't want to go back to my stock mid so I had the flows welded in
If you are considering an exhaust change from your MAC mufflers go with the 40s, you wont regret it.