Changes for xr8

TOO many differences to detail here, but in a quick summary: the XR8 V8 was uprated from the standard engine to 170kW at 4500 revs and 398Nm at 3000 revs; the suspension was retuned and lowered 35mm, with revised rate springs, revised shocks, bushes and roll bars; and, of course, there was the external styling changes and an interior makeover with sports seats et cetera.