It works. a nice little increase of performance. Give you a little jolt when you "step" on it.
The signature AMG exhaust "backfire" sound disappeared for awhile. I was very disappointed, but surprisingly, it came back only a few days ago. Now, I think it is back to normal. A few guys on the forum, who own C450, said that it takes a few days for the ECU to fully adjust to the tune and the sound to come back to normal. Mine took over 2 months! Well, at least it is back and sounds amazing again.
Installation was pain in the axx the first time. took about 1 hour. Now, it takes about 20 minutes. Still pain in the xxx since the airfilter box is completely in the way of one sensor and is very hard to remove.
CEL. No problem so far. I swapped out the tuning box with the bypass unit to get the car back to stock setting once. No problem either.
ECU tuning price has gone up so much these days. I thought it is a little expensive. I think many companies just buy the same software from the one tuning company that creates the program and manufacture the box/chip with the name on it. This is probably still the least expensive tuning program out there.
Last edited by yxc145; 06-17-2016 at 11:56 AM.