Originally Posted by Jeef Beef
While PROcede currently runs lower boost numbers for the N55, a PROcede tuned N54 335i will have the EXACT same numbers as a PROcede tuned 335iS. iS gets the benefit of extra cooling which would be helpful in keeping it going for longer, but does not offer any power advantage. They are both running the N54, and the PROcede will arrive at the same peak boost for each.
Overboost doesn't do anything for a tuned 335iS. Not being anti-iS here, but it's a fact that a PROcede runs far higher boost than even the overboost function. So activating it wouldn't change power/torque at all.
I am glad that at least someone on here knows what they are talking about...