Imo the standard 4x4 box is about as good as a chocolate tea pot I've done two and I don't mis-treat my car, what you have to watch is going from neg boost to max boost particularly in 3rd gear as that's the one that messes its pants quite regularly also the constant launching tends to do them no favours either,

I am in the process of upping the power in my car GT30 etc etc, hoping to get around the 480bhp mark

am thinking about one of these kits from Italy if it does what it says on the tin I think its quite competitevly priced compared to other kits/manufacturers out there

http://cgi.ebay.co.uk/COSWORTH-4X4-R...parms=65%3A12%
7C66%3A2%7C39%3A1%7C72%3A1689%7C293%3A1%7C294%3A50

Luciano