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Message: [QUOTE="SFO, post: 831496, member: 21864"] Swiss, Your account seems accurate from my memory. Once we had the head, intake, cams, we began to diddle with pipes. It helped that Doug was finishing on the podium hence everyone began to send us pipes gratis. The tapered head pipes and megaphone designs all created non-linear torque curves on our engine. The best peak # we got was with a Akrapovic but it had the choppy torque curve. When Doug actually drove it he was pretty quick to give it the thumbs down. None of the fancy pipes worked with our combo. The PC pipe we ran was an off the shelf pipe that had a spark arrestor screen in it. The screen made no difference on the dyno so we left it in. I can say this about the big carb, we went from a 158 main to a 195, which implies some signal strength differences from my limited understanding. Bill [/QUOTE]