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Thanks. As an update, I just got a text from the lead tech at the dealership. They’ve had the truck for a week and haven’t found the issue. I did reach out to Whipple, and after watching a short video I made, they think it’s either the exhaust valve or the SC pulley clutch.

I relayed my research (two threads here) and now they’re leaning towards the SC pulley. In a bombshell text, the tech told me that they may not even be certified to fix it.

I had a bad feeling after reading two other members’ threads since they both end in buy-backs.