[Delnari]

Having tried Stage 1 in my M235i (two-wheel drive) I can say the car does feel more lively than stock. Power delivery is uniformed as described by Steve Dinan in the other forum post.

Why I switched back to a cheap piggyback (aFe Scorcher) was the instant increase in torque over the Dinan system and more peak HP. These are what was most important to me, and the fact I can simply unplug the box in less than 5 minutes to return back to stock. I don't doubt the Dinan system will be a better lasting performance upgrade. Personally, I will be done with my M235i in 3 years or less and really not worrying about it as it will never get over 25K miles during my ownership.