The Supra diff is a 3.9. I was thinking that 330mm front discs would be plenty for track use with 4x4 rears, Or will go back up to 300mm 4pots on the rear to suit 355mm 6pot fronts too.

Which ECU would you recommend that has the throttle position and boost as you say Mark?

Is there anything else you'd like to see on a track car, for performance and reliability?