Originally Posted by wibbles
Valvetronic is all well and good until BMW detune your car without telling you when it's serviced.
I am a big skeptic of this issue my friend. I made a post on this issue at one point. I brought my 135i in for it's first service a while back, and the service rep told me they had to do an update to the DME but never gave me a straight answer why.... I will admit afterwards my car did not feel less powerful in the long run, but my throttle response became weaker on the low end and my exhaust note completely changed... It used to growl (burble), especially when the revs would fall(decompression) ... I might be crazy but to this day I'm convinced that BMW might have accidentally added the ppk to some factory cars and then realized it, and inconspicuously removed it.....