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I had the Evosports pulleys on my M6. I was tracing a vibration issue, it turned out to be the flywheel but I removed the pulley.
There are lots of vids of people with pulleys and without.....
IMHO, I don't think it actually does anything. I don't miss them, my car is just as fast without them.
The big minus to the pulleys on the M6 was the oil temp is usually higher (I am sure the coolant was too but we don't have a coolant gauge)
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"Aerodynamics are for people who cannot build engines"......Enzo Ferrari
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