Hello everyone, I recently purchased a 17 GLC 43 and I love this thing. Like always want a bit more so I thought of increasing the horsepower Via tuner, RENNtech is a trustworthy brand but, they want my first born and his college savings for it. The rest I don’t know much about and I recently risked it and purchased a RaceChip GTS Black which didn’t work at all and I had to spend $150 just to send it back to Germany! All I want is 60 healthy bhp and same amount or bit more in Torque. Oh, and must be a piggy back, I don’t want a bench tune. Any thoughts?