Bill and the guys at MAC will take care of you. Adam (Skip) is an awesome mechanic and Nick their tuner can work magic. I don't trust my car to anyone else. FI definitely adds a lot but you will only get 80% of sea level boost at our altitude. My Stillen supercharger with the 9 PSI pulley only makes around 7.2 PSI. Here is a link to my review if you are interested. I have also had suspension and brake parts installed at MAC.
Review: MAC Autosport Stillen SC Install on G37s
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2008 G37s 5AT, Stillen SC, Stillen CBE, Stillen tranny cooler, DBA 5000 front/4000 rear, Stillen sways, Tein SS-P coilovers, SPC front & rear control arms, Goodridge lines
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