Jim, good points.

On the displacement issue, this -- risk of cheating -- is true of most piston cars. You've been in rotary land for too long!

On my car, there are no visible outside differences between a 3.5, a 3.9, a 4.0 and a 4.6 Rover V8 block. If I was cheating, you couldn't tell by visible inspectin - at least not until you saw the car on the straightaway.

The Jense was teh same way. A simple crank change and the motor becomes a 2.2.

THe point is we can't class based on a fear of cheating. We just have to get better at policing.

But your second point is valid. Do the cars really fit in ITR? I think they MAY, which means, let's class them up and let some one try to make the brakes work. Because they may.....