Eurocharged knows their $hit too.....From AMG's to M's. Getting rid of the stock cats makes a HUGE and noticeable difference.
Then get some 1/4 mile times too
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2014 M5...AMS downpipes, BMS tune, lead foot
2011 X5M....Downpipes, exhaust, dyno tuned
2008 Ducati 848....pearl white, Termignoni exhaust
CLS55 and C6Z06 (previous rides)