The acceleration doesn't necessarily relate to the gear ratio though - the ST170 doesn't have to wait for a turbo to kick so could well accelerate better from idle to, say, 3500rpm. Gears convert and input speed to an output speed, so the only way to know based on in-car performance is if it does the same road speed for a given rpm.

You can get an ATB for an IB5, I think, and can certainly get one for an ST's getrag box. So it's more likely one of those options.

Either way, the sensors won't be massively expensive so maybe just go for it?

Chris