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Have full gtc exhaust. Only ever close valve for cold starts in my neighborhood at 6am to make my wife happy (closing valve makes a huge difference in this regard). Otherwise, always open. I don't know what it would sound like w/o the LXR pipe. I had AMS catted DP's but damn that's way more aggressive and nasty. The second I switched back after several months I was like man this is the right sound. I think full cat back is perfect.
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Rivian R1T
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