I agree some education is in order ..What exhaust bridge are you referring to?...did you say you bought your bike new in '88?.. is it still stock porting?... the guy you bought your pipe from is the HRD king, surely He has explained some of this stuff already to you..?   Is it your own motor you are going to build? What kind of riding do you do? How many hrs do you expect to ride per year? Do you have a problem paying the high cost of race fuel? Do you have the ability without a video to R&R your own topend? What level of riding ability do you consider yourself?  Are you planning suspension upgrades to compliment the HP increases? Have you ever considered buying a 4-Stroke to eliminate periodic maintenance issues associated with 2-Stroke engines?