Originally Posted by Satalite
Why do all these tunes advertise much higher, but with the 15% loss still doesn't seem to add up? Am I missing something?
Seems as though the stock 135i gets a huge benefit from tunes (80-100hp) rather than the 20-30hp benefits from the 1M tunes?
because the 1M already is eating into that tune space to get its gains above the 135. The tune can only get to where it gets on the 135 since the M is halfway there the tune just picks up the last half.