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fullerra · 04-20-2014, 10:24 AM

I have had these on my car for the past 3 years with 0 problems. I'm not certain about the power gain, as you would be hard pressed to fin many people with pre and post pulley dynos but in theory it makes sense.

04-20-2014, 10:24 AM	#2
fullerra Private First Class 14 Rep 164 Posts Drives: 08 Z4M Coupe Join Date: Jan 2012 Location: Boston, MA iTrader: (0) Garage List test test [0.00] 2008 BMW Z4MC [0.00]	I have had these on my car for the past 3 years with 0 problems. I'm not certain about the power gain, as you would be hard pressed to fin many people with pre and post pulley dynos but in theory it makes sense.
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