Quote Originally Posted by Z3_GoCar View Post
The same as.... the chassis, the motor, or???
Good point. The rule stems from someone - a BMW driver, of course, trying to install a 4-choke ITB intake onto an otherwise-STU compliant engine, that would have provided a distinct competitive advantage. I'll bring this to Eric Heinrich's attention, he can explain more.

If we need to, we'll adjust the verbiage.

- GA