I bought this from a fellow member who had custom valves (through the factory sport mode) and i can bypass the mufflers with a push of a button or run full exhaust. I can't even explain how much the car picked up off a roll over 50mph. The car pulls so so much harder. I am thrilled!! I will post some vids tomorrow of no muffler and with muffler. The great thing is that even at 70mph with the valves open there is no drone whatsoever.
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