HI all, long time reader - first post! I am contemplating the purchase of an early XR6-T for a development project and, from the many many posts here, the 4 speed auto is a throw away item once average to serious power is applied.... My question is, does anyone have info or advice on converting to a ZF 6-speed auto, or should we just slot in a beefed up C4? I would like to retain the electroic box for tuning purposes BUT there are hundreds of sub-10 second drag cars out there that have no reliability issues with a properly built C4. Thoughts, advice and first hand experience welcome!