Heya,
I think thats the mod most of us do as well. Then mix in some Eibachs, Konis and some rims and tires and the GP becomes a pretty competitive handling machine that can
the competition.
There's even one autocrosser from Texas, JP I think his name is, who out handles M3s with his modified GP.
So you know the potential is there ... just gotta add some parts to realize the full potential!