Yep, each person/bike combo will respond differently to this mod. It is definetly not a 5-10 hp gain as we all would like BUT on some motors it should make it start easier and rev a little snappier/crisper. Might even be able to run a bit richer jetting with this coil. After selling several of these Nologies, i finally got the chance to install one this weekend and it did make it snappier and ran alittle better! Just my .02