I'd say it works well, and that my complaints are more about me being picky than anything. I want the s54 to make m54 noises, but that just won't happen. I've been watching videos of guys with intakes and headers, they don't seem the have the sound I'm looking for either
the two engines are very different afterall, maybe I shouldn't expect them to sound the same
I drove in to work this morning and it was pretty cool
the cabin vibrates with some of the really deep noises