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In Reply to: Agreed, but posted by spyglass on March 17, 2002 at 19:10:32:
I would think also that the 540i engine isn't made for the same hp as the M5 engine, so things like crankshaft/connecting rods/pistons/main bearings/dry sump pump (not present in the 540i), probably cooling system, would make the M5 engine much more robust and reliable; even though the supercharger on a 540 makes it put out almost as much hp as an S62 engine. In the "upgradable column" you need to consider drivetrain stuff like engine mounts, heavy duty clutch, gearbox, (the 540i auto transmission probably isn't made for that much hp), rear end, etc etc. And the brakes are much bigger in the M5, steering is much different (quicker ratio, more road surface feedback in the "sport mode", suspension is much different...). So on a track where your going around corners and braking, it is not much of a match...and I'd worry about blowing out the engine eventually... if you were to upgrade all that stuff to match the M5, it entire package would probably cost way more than a new M5 anyway.
The 540i is nice, but it's not a race car like the M5...
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