Pull the pipe and make sure the power valve arm is correctly attached, these break on the early models. Then put just the pipe back on and run it to see if the power valve is moving under engine rpm.
Other than that do a leak down test on the motor, it will tell you if you are leaking oil in to engine via the transmission.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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