Found this article as I have been reasearching the type r engine and mods available!! I think the bits about the gear ratios are very apt as with 15" tyres the gearing will be very low I guess about 4500 rpm at 80mph and on the jdm even higher!
I'm glad I don't have a jdm engine now reading about the lsd
Craig
http://forums.seloc.org/viewthread.p...ge=1#pid770171