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Building power is an extremely complicated process if you want to get it all right. It is easy to say that you need more air in/out for more power, longer stroke/large bore for more power. But when you get on the dyno (or hit the throttle), there may be a gain, but you are going to have these two lines that dip around everywhere.

You have truely understand what cam duration does to the engine, what lift does, why you want the proper sized intake and exhaust (what people falsely report at "backpresure"), proper intake and exhaust length, fuel delivery, egnition timing, and a lot more. After you learn all of that, then you have to figure out how to put it together to get what you want.

Best method for those who do not want to go through the effort of the above (99% fall into this catagory), see what others have done, see what worked and what didn't. But look at a system, not a part. Just because pipe A worked good on this guys bike, doesn't mean it will work just was well with your cam.
 
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