Sorry for the redundancy of such a question as I'm sure it's been posted a million times...
I've only had my 1996-M3 for about 3 months. Looking for that +20hp-ish boost that the DYNO runs say an OBD2 vehicle can put out.
On the Turner website, as well as the JimC version, you have to unpack your ECu and send it off to them. I live in CA and commute about 1.5 to Silicon Valley. So being down a car for a few days could get pricey.
I read DINAN offers a similar ECU flash but how are the dyno numbers? And is their bill $299-$399 too?