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Pregens really benefit from better jetting, especially if that ridiculous airbox is messed with. I think one can get 2 birds with 1 stone by going at those CVKs w a jet kit while cleaning everything. I have good results w Dynojet stage 3-ish kit w pod filters but the intake noise can be a bit obnoxious for some riders, and the Factory Pro kits seem to be a more popular approach. The stock exhaust system doesn't seem to be too much of a limiting factor aside from the extra weight of 2 mufflers- I hammered my baffles out, felt no discernable diff in power band, and couldn't deal with the racket lol.
p.s. I was led to believe the issues with valve lash closing up and burning exhaust valves were more of a thing with the '89(?) and older models, as they apparently had softer valve seats. My '06 w 26kmiles was still on the loose side of ideal but I don't know when it had been adjusted last, probably about the same time someone snapped of a valve cover bolt in cam tower lol.
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