well the advancer is for sure. i cant say enough good things about the Factory pro +4 degree advancer i bought, love it...made a nice difference.
i hear that getting aluminum fan blades actually do a lot for cooling so i would say yes on that as well, but i live in socal and even on the hotteset day my bike doesn't get soo hot that i need to upgrade the cooling system.
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MODS: Goodrich Kevlar brake lines, Factory pro Jet Kit, Factory Pro +4 degree Ignition Advancer, Muzzy's Titanium Oval Bolt on, Super Pole 360 degree race pegs, & -1 tooth front sprocket.
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