As an N55 owner, I would say go with the B58 in the '40 cars. That engine is soooo strong. I like the look of the 4 series, but really, go with what's practical for you in terms of 3 vs 4.
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Glacier Silver Metallic 335i X-Drive - Can't leave well enough alone...
Fabspeed DP, Wagner Evo Comp II IC, ER CP, BM3 Stage 2 93 OTS, Bimmertech Amp (more to come... always more)
Graphite Metallic X3 (nothing yet, but... you know)
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