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i understand they are good on the clutch side. My question is are they good on the can side, the reason i ask is because i though you need to keep heat in the pipe to make good hp. Am i wrong?
 

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keeping the heat in the pipe is there to make the power, yes. BUT the amount of heat produced, exceeds the quantity needed, and in alot of cases when on a long haul, gets TOO hot, which is not good. Thats why keepin the engine bay, cool (it will still be VERY hot regardless) is a good thing. Why do you think people are putting all the hood/belly pan venting systems in? (example: frog skins, screens). The dirty, hot, under-hood air is not good for the motor to injest, and fresh, cool air is better for it, which is what people strive to get (cold, fresh air into motor-thus, under hood)......

Understand?

btw, the only reason people keep the clutch side vents in is so they belt doesnt get wet.
 

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I'll have to agree with what jesse said. Your pipe will remain hot, even without a hood. Maybe not quite as hot as with but still hot enough. Keeping the clutches and belt cool is a good idea, but not to get snow or water on them is another thing. I would think even a fine screen would allow some water or powder to get through. Even with no hood, it will still be possible to overheat the engine.
 
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