So what I'm looking for is this winters bike tear down and what direction I should go in to keep up with my brother in laws vtx1800. Is it possible to do this and still keep the longevity of my motor or am I gonna be rebuilding things every so often? Right now he is stock but will be adding in a full intake/exhaust system and fuel management with dyno tune. Already he completely blows the 103 away so am I looking at a 107/113/124 or do I need to go big and look at the 131? I still need rideability but Im a little tired of watching him burnout in second as he blows past me.