You will always be unhappy with the hp production of a new pipe, or any other mod except a turbo for that matter.
If it's really hp you want, then select the one that all of the winning super bike teams use and that Yosh puts on the Busas upon which it's staking its "street special" production reputation.
That is why I selected Akrapovic. My results are OK @ 165 SAE rwhp; in-line with what credible people like Turbo Rick have experienced, and I believe that this pipe has the best potential to maximize any future motor mods I do. Cams go in within weeks.
I've been hearing a lot of noise about the Muzzy pipe and like Dana I'd like to see some independent results on it. What Rob Muzzy says is self-serving and therefore irrelevant.
I'm also skeptical about sea-level dyno results like the ones some members have been getting in Florida. If it's true that Denver bikes, at one mile above sea level, are getting 10% less hp (one member said they're getting only 117 rwhp at that elevation!), then results in Florida are at least 4-5 hp higher than those which will be obtained by people who live at 1,000+ above sea level...which is where most of the North American land mass is.
[This message has been edited by Dirty Pete (edited 15 March 2000).]