I've got a '13 335i and I owned a w211 e55. The e55 is a monster. That supercharged 5.4l is on a whole different level compared to the n55. If you don't mind the old school auto transmission in the e55 then it's a no brainer. The only real disadvantage to the e55 is the air suspension. It can be floaty feeling and doesn't inspire a lot of confidence. The e55 makes a beautiful noise too.... the 335 not so much. Maintenance is comparable. The air suspension being the big ticket item that tends to be iffy. The drivetrain is bulletproof.
I miss my e55 just thinking about this.
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