No, the sump actually does hold the front diff



Its not a huge job to get it removed, we had it done to the RB26 in the S14. But the little things add up, to the over all cost of the conversion. The engines aren't cheap, so maybe a top mount turbo, ecu injectors and a map would be cheaper for the performance gains.

The RB25 box does bolt straight up too, so no problem there. The wiring isn't much of an issue if the engine is from either the R32 or R33.