[///M ARMY]

No Flash at the moment.

Tunes:
Alpha N
Dinan
JB4

Best bang for the your buck....

JB4

None does have a warranty with BMW

Dinan has a warranty but only with Dinan. So its a "Dinan Warranty"

I have been in many cars that have JB4 and (1)alpha N and I would choose JB4. Haven't been with Dinan or will ever choose to but there is a review regarding its tune. I believe the majority have JB4 over any other. Tested the Alpha N and the power isn't there.

So far JB4 has the highest WHP out of all the tunes so far. After putting over 4k miles on a the JB4 and 1k on the alpha N (another M3 sedan) I would say that it offers the best performance wise IMO. Other peoples reviews are welcomed.