MOPED ARMY

you're correct that it tops out at relatively low rpm because of the length of the header, but that's the point of the pipe - it's designed as a low end pipe. the estoril motor gp race course had vicious turns and grades . . . the estoril pipe is called that because it boosts the rpm range you'd be in a lot on the estoril race course. so you could hack that pipe up to be a top-end booster, but why? if you offer it in trade on buy/sell, i'm sure you could swap it for a proma gp or a 6p or something, and then you'd have a pipe that was tuned specifically for the power band you're aiming for, not just a hack-job that does the trick. just my $.02.

and maybe i can play with it and tune my pipe for how i want it to perform

instead of trying to trade or sell it and buying a new one and crossing my fingers and hopping that it works.

plus i think it wold be cool to try to modify and pipe and maybe gain some knowlage

i believe there is a LOT you can read about pipes and their shapes and sizes and all sorts of shit, instead of guessing i think you can actually make a directed decision if you do enough looking around.

that being said, how heavy are you tuning the carb and set up for each pipe change? if you are bogging with a top end pipe re-jet, tune tune tune, and get it to blast. a fast ass pipe that you have a jet that is too big with will still eat your top speed.

my timing was a bit off and i had a jet size too big and i used to hit a big RPM wall... 4 stroke and crap just as i was cruising into my top speed....

you can learn about pipe design in Jennings two stroke tuner's handbook here: http://www.mopedarmy.com/wiki/Category:Performance_Tuning