I am considering putting on some true duals, probably V&H, on my '05 RK. I currently have a Stage I done along with V&H Oval Slip-ons. The bike runs real well. My question is this. If I keep everything else the same, but replace my stock headers with true duals such as the V&H, will it make enough of a difference in the breathing of the engine to require new mapping and another run on the dyno? Thanks all

 

YES, get it on a dyno for a precise tune![:@]Best money you could spend.