[Mdecisive]

Hey guys,

I have a 2010 N55 135i 6mt, i bought the car with 33,000kms on the dial, but since i bought it i cant keep it at full boost in a high gear (e.g. 4th gear from 80km/h>)

Ive taken the car to BMW, they don't know what the issue is however they did say the turbo was overboosting. I'm lost for what it may be atm. The car is currently down at Advan Performance, i have a lot of faith in them, but i still don't know what the issue is.

i can't charge through the gears either, it'll just throw a code. only mod atm is an evolution racewerkes CP.
we have changed coils and sparks, serviced it.

any ideas?