A few sources I checked stated 8250 rpm max for the B7 RS4 engine, but no matter. And the S65 rod bearings are pretty much a service item. As I said I like an estate and awd, there wasn't a period M3 estate, but the engine was in a better position. And with a throaty exhaust I think the BMW sounds better than the Audi at high revs.
 
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I'm referring to B8 RS4.
8250 is max power rpm!
It continues until red line at 8500, but its academic, my personal preference, I would prefer the RS4 vs M3. Each to their own!

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