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Not allot, k&N drop in filters and a serious remap by one of the best companies here in the UK (DMS). I used them due to their rep and the fact one of the main guys has a heavily mapped M5 and a ride in that convinced me.
TBH though dyno results vary and mean not allot. All I know is it's fast and has no limiter speed wise now. My old HSV Holden was SC'ed (heartbeat) with loads more and did about 640hp and the M6 would destroy it totally and I used to think the Holden was fast!
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