Didn't see the segue where you went from talking MB and BMW to Hurricane. Probably because there wasn't one, so hard to know.Apples to oranges, I thought were comparing Hemi to a Hurricane.
As far as Hemi vs Hurricane and making modifications. Once you stop comparing stock to stock, it's also an apple to oranges comparison. And once aftermarket support for tuning the Hurricane happened the Hemi will still be second fiddle when it comes to performance. Just putting a supercharger on the Hemi and nothing else, it will still be slower than the HO Hurricane.