I recently changed from V&H Pro Pipe (2 into 1 system) to the Vance and Hines Big Shot Duals (dual-pipe system). Does anyone know if a new tune is necessary when pipes are changed? If so, how?

Thanks

 

is it true duals or stock head pipe 2-1-2 with slips ons?
either way i would retune it. Would be more inclined to tune it if it were true duals because of the loss of back pressure and a more "free-flowing" exhaust in a true dual setup. Most folks who put on true duals wind up compensating for the loss of HP and TQ by adding a set of good cams. Just my .02 worth. As for tuning, open up the software, find a map that closely resembles your engine build and modifications, and smart tune it. Smart Tune only works with certain versions of the tuners. If you have the SERT or the SEPST then you can smart tune, otherwise you'll need to find a local tuner to help you out.

 

They are true duals and ill have to look for the smart tune setting. I didn't see that when I browsed the program yesterday. Thanks for the help.