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I don’t see the benefit to one on a truck that already has one. They were worth it on the earlier trucks with the rubber that would walk out especially when you started adding some RPM’s for pulling or drag racing.
Block temperature vs outside air temp are 2 different things, depending on overnight temps cold soaking the block and how long your truck was in 80 degree temps it makes sense the grid heat was called for. I never let mine cycle, just double tap the start button and it will bypass the initial...
Sounds like your transmissions gave you the old Mecka-lecka Hi Mecka-hiney Ho? Anyhow I never ran any ats products but like any massive company y there will be some with issues and the quiet majority never says a thing. The good thing is if there is an issue you can go see them vs call them from...
There is a gasket at the end of the downpipe also right after the DPF I would inspect those. Also check out your egr piping under the hood. Following that check the exhaust manifold and connection to turbocharger.