RE: camshafts and wat else??
Don't know about "serious" gains, but most race spec camshafts are worth 5-6rwhp, mostly all at the top end (10,000+rpm).
What all you need depends on what you get.
For Example, Erion Racing claims their cams are drop-in replacments. They keep the same profile etc, so you don't even need to re-shim the valves. You just buy them, install them and *poof* extra zip up top.
You also have:
Webcams
HRC Cams
Tornado Cams
HRC has several different versions as well... JSB, WSB, Enduro, etc...
Some will require valve springs and/or ECU to raise the rev limiter high enough to benifit from the new power curve.
You're gonna be looking at spending about $1000 for a set of cams... so if thats worth 5-6hp, go for it.
The first thing to do would be get a Full Ti Exhaust system. A good one (~$1200) will add 10-14hp AND save 10-15lbs. Thats alot more bang for the buck.
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