The Lost Boys are the most gracious and kind people. It has always been my thing to jam on them. "those gosh darned lost boys"
Those stock pipes will come apart and you can burn them out in a charcoal fire then shoot the black again with paint.
Other than that the pipe I sugested might get you 5-7 on the top end.
Pipes is all about RPMS and I'm afraid RPMS is all about cylinder kits.
Or you can get both sometimes with a big strong man, and some times a good book or the Wiki is way better.