Matt,

I had unarguably the most developed ITA Z3 in the country. I had left very few stones unturned. I hadn't gone through the (academic) exercise of a full standalone ECU because it just wasn't worth it. The engine is pretty much maximized from the factory. The best we could do was overcome driveline loss...for about a 15% gain. The rear suspension is horrid and it has the aero of a teardrop going in reverse. Brakes are great, it's super reliable (it's a BMW), and it's relatively small. I too feel that the rulebook is catagorically against the car. I've argued it before and I'll argue it again. I don't think (with all due respect) that the ITAC got it right with this car. I'll include the 318ti as it's virtually the same car. To even consider it go for the 318is as Christian said....much better rear set up....but it can't make weight, especially if the ITAC ever lowers the weight (unlikely). Now if you want a car for endurance only racing....it would be one of my first picks.

R