To be honest steve i havnt used a 70mm one but a few 60mm ones that performed well enough so know the 70mm one will be good..
When i had mine built and specced by pro alloy they talked me out of the 100mm and even the 85mm one and made me a 70mm one as they said to big is as bad as too small!!!???
So i went with that and its good on my engine...i reckon on your car steve the airtech 70mm is a good choice...


cheers danny