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I have seen programs where the take a look at these things and then tell you if it's a DEAL or a DUD. This was a total dud. It doesnt' do anything at all. It might actually give you less HP becuase it messes with the air going into the intake.
 

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I think it's a dud man. I've never seen it, but I don't know what it would do, it's just twirling air around. That doesn't help it to make a bigger combustion in the cyl. IF this worked the mfgrs would be putting them in stock.
 
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