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I can't say I've ever seen a non original RSR 2.8 motor make over 300bhp or even near 300bhp actually. The original 2.8 RSR used different heads, the valve angle was different so it could use 49mm intake valves, the intake ports were 43mm! Compression was very high too, higher than 11:1 I believe, Ti rods, it made 308bhp or so. That was the 'full bananas' race motor for Porsche then too. With modern cam profiles I'm sure a tiny bit more could be seen, but not much.
The wackiest build one could come up with and still have a streetable 2.8 engine with 46mm intake valves and 38-40mm ports would be hard pressed to see more than 280bhp on pump fuel.
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No physical quantity completely explains its own existence
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