Just to let you guys know my thoughts for my Racechip Ultimate.
2014 335i
With Afe intake
High flow catted DP 200cpi wagner tuning
Supersprint full catback exhaust
ER chargepipe
Racechip Ultimate setting on 4!!!!
Been on it for >1 year
Using 98 Shell Vpower fuel (RON 98)
No issues to date.
Pulls like a freakin Mofo!!!
Took out the RC yesterday to take the car in for a service, and it was slow as hell especially mid range pull.
After service, took car home, re-installed the RC on the same setting "4", and it was like the car got a steroid injection.
Forget the hp increase guys, it's the torque increase that is staggering.