Get downpipes or just gut the stock exhaust, get the ACM exhaust mod.. best bang for your buck
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2008 335xi Jet Black// Coral Red
VTT Stage 1+// Procede V5//VRSF DPs//AMS FMIC//KW V1//M3 Sways & Sub Bushings// Alpina AT flash
Apex EC-7//Michelin PSS//Dinan CAI
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