I,ve got the 8Valve gti engine in mine, its a '92 so I think they are the same engines (correct me if I'm wrong)
But I had a mongoose centre pipe and back box fitted, it was custom shaped for the fitting, but the bore of the pipe is huge and has made a marked improvement in the performance. I had a power-flow end put on the pipe instead of the mongoose one, looks very nice - single pipe about 3.5" with a carbon fibre wrap. Sounds very sweet too.