Originally Posted by elitefusion
I did this yesterday as well on my 2011 335i xDrive Coupe (automatic) and it sounds AMAZING! i did notice that the gas in the car started to drop in MPG for some reason, but i think its because i was in traffic and just happened to pay attention to it a bit more then usual lol
Hey did it show any errors after that? Cuz I do too have 2011 335i and I don't want the dealer to find out.