Thats the thing though. Before you even start looking at anything over 400BHP on a 4x4 cossie, you need at least 5-6k in the transmission before you even think about using it hard, and as I'm sure tim/mark etc will say 5-6k in transmission is not a lot really, and serious kit costs serious money , look at yum, huge engine, but the transmission is light years behind it , the MT75 and the upgrades for it are still limited by the original design.

EVO's etc dont have to worry about much under 500 BHP.