I just bought a 2007 with UFO 4 into 1 and at first thought it was too loud but that was because the last 6 VMAX'S I owned stayed stock so any headers would sound much louder to me. In fact I offered to trade them for stock.........lol then decided to keep them and try them. I'm glad I did, the UFO pipes sound awesome, I pulled up next to 2 harleys today and they both looked back at me....lol
It's not just loud it's mean sounding. I just dropped my bike off to have Seans jet kit installed tomorrow. Once I get it back I will post dyno specs, pictures and video so you can hear it.. Now had I been looking to buy new pipes I wouldn't have bought UFO because of Jon's rep.... I read too many bad things about him on here for customer service.
With that said, as long as I don't have to deal with him I love the sound and perforance of the pipes and can't wait to see what Sean's Jet kit adds to my VMAX...
When you look up "customer service" Sean's picture should be there he has helped me a lot and I plan to buy his custom seat next..
Ron