Quote:
Originally Posted by VintageBMW
thanks - I will pass along your comment
 yes, go with the ESS tune it is great - for us, the Stage II is plenty; if you are going State 2 or 3 you should probably look at some intake and exhaust mods |
Stage 2 is our most popular tune for the Z435i. Stage 3 requires an aftermarket intercooler and 93 octane. Stage 3 is also much more dependent on fuel quality unlike stage 2 that can run on 91 or 93.