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Z4M's with header back exhausts and tunes can get up to 315whp, which with its lower weight can do well against many other cars.
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Thats got to be STD not SAE and not a realistic dyno. Cat backs and a tune maybe 10rwhp at best. My E46 M3 with SuperSprint headers, 100cpi cats,no resonator midpipe and Borla mufflers made 302rwhp/246lb ft.of tq SAE. Now my car with software probably got close to 310rwhp after this but thats about it. This is on a dyno where bone stock E46 M3s were dynoing 270s, some in the 265-270 range.
Dave