I've been looking on Cobb's site and it shows that an "aggressive" Stage 1 tune will yield a gain of 8%HP / 6%TQ on a 335is. I'm not sure if they are basing the TQ numbers off of overboost or not. I'm also not exactly sure what an "aggressive" Stage 1 tune is. I thought Stage 1 was just stock setup?
Is is worth it to get Cobb for Stage 1 only? I may upgrade to other stages in the future but that's not something I'm doing anytime soon.