3,73 it will have so much power your 1st will be useless, the 3,73 will at least minimize that The Ebay kit will be available in about 25days so I´m counting down to buy it for the M42. What changes did you notice with the COP ?
Is your car going to be this fast?http://videos.streetfire.net/hottestvideos/2/951fcba5-2248-4bc2-91d4-4fdfa9a61893.htm
Best guess, what rpm's will the boost kick in on that gt28r? The faster the better.