Originally Posted by stickshifter69
35i is just as fast as the 35is with software tune. Same engine. I've read rumors about the 35is becoming extinct for an M35i....
I just check on real oem and the 35is is classified as N54T and the 35i is N54
Check out the bottom of that first post with default jb4 settings for "regular n54" and "1m/335is" (N54T)
The boost targets are higher and start at the peak boost at lower rpm.
It is all speculation unless cars are raced heads up but I wouldn't be surprised if the 35is was quicker than 35i (stock and with tune)