So I've seen the marketing literature but I want real worth experience. Do these things really work?
I've already got a gnarly pipe and boyesen rad valve. Sending off head to Eric Gorr after Xmas. Don't mind spending the cash if I will actually notice the diff for woods riding.
My gut says that they're bling.. Maybe if the bike is absolutely perfectly tuned, you'd actually feel an improvement?? But really, how much can a powervalve cover change the performance of the bike?
I'd ask Eric. He may have a more informed opinion on it.