First off I would like to thank all of you for your input regarding a swap from an M5 to an M6. I ended out doing it for a mere few thousand difference so I am quite happy about that. My question now is for those of you with the Dinan Performance Engine Software, how do you like it? is it a noticeable change? how does it feel? Any input would be greatly appreciated. If it is quite a bit of difference I dont think you can go wrong for $995.