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Old 08-22-2009, 10:56 PM   #8
Drives: 2010 2SSRS m6
Join Date: Jul 2009
Location: Memphis ntn
Posts: 225
I have to agree. You get very little if any out of them. I have dynoed with no belt at all and only picked up like 4 hp. So I know an underdrive could only give you like 2hp or so. that is not worth the potential negatives or even an install to me.
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