s63 ECU upgrade
#6
I did a ecu and air boxes at the same time and I had them do some little things in the intake side I saw nice gains on the road I have not put it on a dyno yet I am sure its 20whp at least the car pulls alot harder now big difference in the high rpm's its wierd though the car does not feel any different for the first 200 miles or so I think the car has to learn