You probably have something that is coming loose and is unrelated to the pulley - it may be a side effect of mechanics touching your car. My Stillen UD pulley causes A/C drain to be less noticeable. I don't have robo-rev matching, but rev-matching on downshifts is perfect now due to the more responsive throttle. Tune generally adjusts engine for different airflow and fuel mix so if you've got those AND this definitely get a tune, but on its own this is a true bolt-on with instant benefits.
Last edited by threeseventy; 11-13-2011 at 01:39 PM.
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