First the 42's;


Then the 52's;


then the comparison:



You can see the drop off's with torque and power in the low range with the 52mm ITB's. By the same token, you can see the extensions in power and torque (as well as the shift in peak power) with the 52mm ITB's

I don't believe that firewall space is an issue, got more than enough room. Cowl induction with a box MAY help at speed, but not sure. My current suspicion is either the ITB's are too small (doubtful) or we have a resonance conflict.

As for torque; the torque numbers fell back to, basically, the same as the 65mm single throttle body. I still like the 42mm ITB's for the street.

Geez it took a long time and lots of effort to get to.....um, pretty much nowhere, lol. But I do have to post up a vid of her running on the ITB's. Just so its out there.