but for the time being if you cant afford a full system why not buy the slip on for some good looks and start saving for the right jet kit and a good head pipe. most people cant afford everything right away so thats what i plan on doing. get the powercore4 now and then mate up a nice head pipe when the money starts flowing again.
I wasn't aware of the head-pipe cost - good points - I was saving for the performance mods this winter anyway - Think I'll stick with that plan and probably do the Yosh RS-2, airbox, and j-kit altogether.Keep in mind some headers (and full systems) have head pipes no larger than an E header. For example, all FMF DRZ specific head pipes are identical in size to an E header. While better than an S/SM header, they are still not optimum. Do your homework before purchasing. Most slip-on's are close to 3 bills. You can get a full Yoshimura exhaust system for around $450. You'll have more than that invested by the time you purchase your slip-on, head pipe, and midpipe (if needed). I maintain it's best to save for awhile longer and live w/ the stock exhaust system until you can purchase a dedicated full exhaust system.
The right jet kit for the Mikuni carb. is the James Dean jet kit (part #JDS005). Excellent product, w/ much less complaints compared to the Dynojet (and all the rebadged Dynojet kits~Moose, FMF, etc). It seems 90+% of those w/ Dynojet kits installed complain about surging/hunting at steady throttle cruising.
I installed fmf full exhaust,air box vents and JD jet kit what a differences over stock. Much more low to mid power no problems at all with this upgrade nice package. Sounds like a 450 dirtbike if looking for that brrraaapppp.