Thread: ISF Exhaust?
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      05-08-2012, 02:33 AM   #9
saeedg48
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Drives: 12 CLS63 + 14 M6 C
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it's a rpm sensitive valvetronic system.
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2008 M3 Sedan + TestPipes + Tune [sold]

2012 CLS63 AMG + P30 Performance Package
2014 M6 Coupe + AMS Downpipes + KW V3