I don't believe it will hurt a thing. When the engine warms up the exhaust brake will drop out with the truck on high idle. At least that's what mine does. I don't have to warm mine up here in SC, but I like that the heater is putting out heat as I leave the house.
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Sunnytraveler
07.5 QC LB DRW Laramie, Black Pearl, Luverne Stainless Running Boards, Bedrug
07 31 SunnyBrook 31 BWKS LX
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