Thread: No power gain from Underdrive Pulley?...
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Old 01-18-2017, 10:50 AM   #3
Boxtaboy
07 Carrera S Cab
 
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Join Date: Nov 2005
Location: New Jersey
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I don't doubt that statement. Years ago, I actually had a water pump failure right after I had redlined my engine during some spirited driving. What I find amusing is the sellers of these UDPs claiming instant 5-10hp gains.
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