Chuong N.
Waste of money
Waste of money! Just go get a real tune on your amg ! I have a amg and engine light keeps popping up! Because of o2 sensor ! I have down pipe , intake , exhaust , bov and intercooler on my amg and this piggy back tuner doesn’t work ! They told me it doesn’t support other mods ! Has to be factory settings and parts ! For 800$ might as well get a real tune ! They said they will take it back only with in 30days of purchase! I purchased this gts black with blue tooth before I bought the mods so what now


