[Cateye]

Originally Posted by Alex84

Good morning,

i'm just purchased a BMW 135i M, so i'd like to do these tuning options:

- Quaife LSD - Limited Slip Differential
- Supersprint exhaust with final and central exhaust
- K&N air filter
- Chip tuning

Also, with these configuration which is the best chip tuning?
Which is the more power and reliable one (perhaps AC Schnitzer or Hartge?)

Thanks a lot
Alex

I prefer Hartge... They are reputable with plenty of experiences in BMW. Another is AC...
POwer wise, +- a little difference.
Go for a DP change if you want more power...