*sorry i typed that earlier but took a phone call and by the time posted it you had already put another post in.
The M3 does not "need" this other subframe reinforcement. but yes they do still get fractures. the LS rear diff carrier design is more friendly to the subframe mounts. non-m + FI is a torn subframe..period.
A ESS, TT FI kit basically maxes out where the M3 starts. An M3 Stage1 91 octane HPF kit makes like 515 Hp. Now that's a base
which will spank and thus humiliate where the M54 runs flat.
The S54 is such a better power plant than the M52/M54/M56 there is no comparison. There is a good reason it won the International Engine Award
and Best Engine
3L-4L category six years in a row from 2001-2006. We're talking a completely street and 50 state smog legal engine that makes over 100Hp per liter.
oh and it makes it's maximum torque at 4900rpm which is not high compared to it's 8,000 rpm redline.
really you're gonna site one guys built turbo 330 against stock M3s. like i said, there are loads of HPF Turbo kits on M3s. where his is maxed out, those others are at the beginning stage of applicable engine improvements. look up HPF M3 Turbos. that mean little M54 won't be doing any fish frys, but rather get itself burned if it goes up against any M3 that have like mods.