Originally Posted by Beemw335
The n55 has a chargepipe that will break with a few extra pounds of boost, they made installing a tune much harder(having to tap into all sensors) and put a tiny turbo that doesnt make much power.
The n55 was made to stop people from tuning theyre 335's.
Bmw put the n54 in the 1m for a reason, its a collectors car and they wanted to give them the more powerfull and more tunable engine.
Now whether the m3 uses a worked n54 or n55, it doesnt matter, its a reworked engine, not stock so it doesnt mean anything.
Yeah totally, they built a whole engine around the idea of preventing people from modding it. Makes complete sense.