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There seems to be used but good condition R's more readily available for around the same price as new S's. Yes i have the deres centre pipe so an S is an option. Just have to see whats out there i guess
New S from Keith at revolution is about the £290 mark I think, but he is pretty good on SNet members for deals
Only thing with the R is it will be boomier underneath the car which is a bad thing IMHO and also with more of the exhaust @ 3" you may notice a subtle loss in torque. My STi was punchier with the standard Back Box when I first changed to the Spec S.