who has used a rev box?

[cals400ex]

i was just wondering if anyone gained any performance from a rev box. i know not much is expected. however, my friend put a sparks box on and he gained some top end. his engine is stock too. he just has a pipe and K&N filter. he didn't gain a ton but it is noticable when we race. we were even and now at the end of 4th and in 5th he pulls where i don't have a change to catch up. i have been told that the white brothers does not give any performance but just raises the rev limit. the big gun is supposed to give a full 2 horsepower but i highly doubt it. any comments would be great.

[yello300ex]

i have a sparks pipe and uni filter and my friend had the same thing and when i put on the sparks rev box and advanced timing key i got a good gain in all gears and i beat my friend by about a bike and a half and he has sparks pipe and uni filter...if u can id get advanced timing key with the rev box cuz it seemed to help my bike out a lot

[Dune Surfer]

I have one. I think they work best on built engines. Stock moters stop making power before they kick in. Build a high comp race engine and I like them.

[cals400ex]

i honestly don't think i want to try to adjust the valves with that key in place. otherwise, i would have one.

don't waste your money :blah:

[Diedrich]

i have one but i got it when i had a 330 engine that was built pretty good and would run..i hit the stock rev limiter alot when racing so i got Profab to modify my box