Hi John, I am Happy with my DP outlaw pipes but had a lot of exhaust popping on deceleration. When I bought the pipes on EBAY the ad said basically just do the 12 minute tune and the Rocket's computer will adjust the fuel mixture, no tune needed. Well that wasn't my experience. What I did was install a power commander V, a bit of a pain in the ass, no room to work and to many wires, but I eventually got It done. The Power Commander V hooks up to your personal computer and you have to adjust the air/fuel mixture.I don't recall the exact mixture I set it at,it was some time ago, and it took awhile before I got the bike to a place where 90-95% of decel popping is gone. I still have some popping if I decel quickly from a high RPM but it is so little I can live with it. I guess I would be able to fine tune the mixture even more but I am happy where I am at. Without the PCV the decel popping was horrible. Good luck. I have my bike stored for the winter, 2 hours from my house, or else I would have plugged my computer into the PCV and let you know what my fuel/air mixture is.