I bought a Power Commander 5 from a fellow Vision rider. It's new, never been installed. I have Atom Bomb pipes on my Viz. I know I'll have to get more fresh air in with a Lloydz top filter and a non stock front filter. No problem. This is for you folks running the PC5, is the performance of the engine that much better once it's professionally tuned ? Is the PC 5 pretty much a bulletproof piece of equipment ? I like my Vision the way it is right now but I have an addiction to throttle response. Every once in a while I like to kick it.