Mad Yum another reader not tester...a Rainbird run a std gearbox not sure about diff...but they are strong anhd without launches i reckon both will hold up well..we aint talking 4x4 mate.

600bhp may be optimistic..depends how good the engine is ..and how good a Karl map is ..may surprise everyone..may not...it will only go on rollers to see..so who knows....but gutting for you if it was more than yours Yum