mods?? please help

[bklyn400ex]

what are some good engine performance mods i can do without boreing out my 400, i dont want to lose any reliability im gettin a pipe and jetting according to it , 14 tooth sprocket and i got a k+n filter

[L.Vegas400]

do a search for 'free 400 mods' or stuff of that sort. there are many many threads about this.