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Originally Posted by JamJay
Hi froop!
My thoughts were that as its only the turbo and DP configuration that differs once N55 mids are fitted to both, the sound would be similar although perhaps still quieter on N54 due to twin-cat DPs. Would I be right?
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Hmmmm
I'm not 100% sure but from what I've read and from the videos I've see there's definitely seems to be a difference. N55's seem to have a throatier sound to it like with the M135i. I've yet to see/hear a videoclip of an N54 which sounds anywhere near as good. N54's seem to just have a predominantly bassy sound to it and lack the character of the N55.
I've driven a friend's N55 135i with an Eisenmann exhaust and it sounds epic with tons of overrun burble and pop but the clips of N54's with the Eisenmann exhaust seem to sound completely different. Much more tame.
It would be interesting to see a comparison of an N54 and N55 car with the exact same exhaust mods though.