A friend is giving me a GT2871R for a SR20. Its my understanding that the manifold flange on the exhaust housing is different for the speed 6 and not simply T25 Flange. Does anyone know where I can get a GT2871R mazdaspeed 6 specific exhaust housing. If anyone has one for sale I will buy it. I have looked everywhere! Would the stock K04 housing work on a GT2871R?