[padrino]

For me it's BMS with the current firmware as it smooths out the power delivery, that was also what sold it for my wife since the white M5 was running the old BMS firmware and the torque was so insane, she still liked driving it that way but the update is a definite improvement.

I need to get some runs so I have real numbers in but at speed I think the BMS is faster, set to 3.5 or 4 depending on what I have in it..

I am not sure about others but before I ran the new firmware the Dinan was definitely smoother and I can see why people would look toward it.

With regard to the warranty.. Dinan does a good job of covering anything BMW will not, however you will be turning the leased car in with a partially voided warranty, and BMW cannot CPO it.. I am not sure how that plays with leases but my dealer said it would be an issue.

In my case I take the 20 minutes to pull the BMS out before the car goes to the dealer, better they always get it without the tune installed..