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my 335d is m57,,didnt make them in n57,,my 330d is also m57,,but not much difference to n57 .and if mapped correctly with all parameters taken into consideration ..diagnostics before map etc to show a healthy car no boost leaks/vacuum leaks or turbo probs etc etc,,then all the tunes and info is data logged and while tweking each time its on the rollers,,proper custom file written by jason.if getting a tune for your car,,then do as i did,,he can map it from his workshop via a live link to rollers/computer at sunderland performance centre,,he did this with my 335d,,7 runs on the dyno ..ie 2 stock and 5 tuned....
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