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will the standard rs4 exhaust fit the s4 including cats? [img]images/graemlins/greyrs4.gif[/img]

I don't know about the CATs but I'm fairly ceratin the CAT back will. I asked the same question when I considered replacing exhaust when I thought it was blown. It turned out to be a broken rear bracket. They certainly look very very similar but I didn't measure it up. I suppose the likes of Millteck who have measured up the exhausts will know you could tell them a little lie and pretend your interested in an RS4 system will it fit your S4. [img]images/graemlins/grin.gif[/img]

If you have complete system including downpipes,cats,exhaust then it will fit just perfectly, but will stick out little bit more in the back, as RS4s are "longer" (as to a different rear bumper)

The complete system will (incl. DP's), but AFAIK the pipework is different at the point where the DP's meet the cat back, therefore not a straightforward job if you are try to fit just the cat-back or DP's.