Is the exhaust cam upgrade worth the cash? Will the auto-decomp. do away with the lever on the bars? Will I need the installation kit. it adds $125.00 and can this cam be put in without it? Also, is the acc. pump cover a good upgrade too, the makers of them say alot about what all this part will do, but are they just selling parts? Any help will be welcomed as I have just bought this bike and don't know more than what I see on the web. It runs great & rides great too,I just plan on some upgrades and want to spend wisely.