i know where there is some i think there GT3071 or 3076 bolt on highflows, only part of the stock turbo they use is the compressor housing from memory, capable of 270-280rwkw and very responsive, from memory there is still 4 or 5 left, they came with there own dump pipe and were to suit r33 gtst's,
stock lines can be used with them, except they require special washers and banjo bolts from memory... pm if you want more info.. i think they were around the $2500 mark for turbo and dump pipe