The 335 is faster and not by a small margin. But what is cool is previously, with the E90 328, it would be a pounding.
The BMS stage 1 N20 tune puts the 328 right back with the 335, even giving it a slight edge. Problem is, the same tune for the 335 is netting some damn good results too.
'98 M Roadster S/C @11-16ps
'06 Saab 9-5 wagon 5mt Aero+ Tuned