nice revive ... but at least you searched
the biggest concern for any S1 exhaust placed on an S2 is the clearance of the intermediate pipe. Naturally an S1 exhaust will have its intermediate pipe curve upwards to compensate for the higher location of the exhaust tips relative to the S2 location. Putting an exhaust that follows that patter on an S2 will cause a few issues. The first is that the intermediate pipe may hang a little bit lower than intended ... if you are at stock height, this may not be an issue. the second is that because the intermediate pipe is sitting a bit lower, this causes the alignment angle of the intermediate pipe to the axle back portion of the exhaust to be offset, which is the common complaint when people notice that one exhaust tip is sticking out futher than the other.
The above most certainly is an example of what happens with the TurboXS catback and may hold true for many others.
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