i dont know exactly what kind of gains youill see,but you should see some gains thru out the power band,the only thing thats beating me up a bit is why did you go with a mild port job?if youre drag racing raptors,and other decently fast 4strokes,i mean even if you ride a lot of trails you should have gone with a stronger play port.at the very least with a good mild port job,and your mods you should beat any piped 4stroke.also work on your gearing,its allabout tunning that baby,for optimum performance.have fun. :: :: ::