335is, 1M, Z4 ect still have the N54 . . .. in USA.

 

right .... same in Europe. But performance wise i consider AT as the best tranny against MT and DKG, and if I were to do it again I'd get an used e90/92/135i AT and start building.

 

That is exactly what I did. I got one of the first customer 335's delivered in 2006. 6MT coupe. I ditched that for a AT sedan a few years later and moved the mods on it. The first time I have ever picked a Auto over a Manuel.

 

A stage 3 with meth is making about 420-440 rwhp. The the GT2 was stock then on a roll that is possible.