I've been in awe of this model for the past few days now. I have always liked the M2 cars but I haven't really researched into them. The M2 1028 had light weight body panels, a different boot lid with a slight spoiler, 8 point roll cage, light weight seats, subtle interior as well as exhaust and engine tweaks. The compression was raised to 10.6:1, the cams were changed as well as various other pieces resulting in 140PS.
Not a huge power increase, but the light weight panels really helped make this car fly. Here are some pics.