Originally Posted by strati1
It was the e92 m3 motor and gearbox that was installed, in Germany someone also shoehorned in the s85 from the e60 m5. The best option would be a new clutch and a SSK IMHO. Unless you want to do the full drivetrain swap it isn't plausible.
that's a different one
if you look up 'wide body E87' it'll come up with an N54 swap with M3 gearbox and other stuff.
ED: your 130i doesn't need any strengthening gearbox wise, z4m came with the gearbox that we have, and they've done many an S54 supercharger setup through it...
I'm banking on it holding an N54 successfully lol
the 135i/335i gearbox could fit (i'm stiull not sure on the bellhousing), but size wise at least. it's a bit higher rated, but still you don't need it at all.