I'm probably missing something. The goal is to bring the coolant to op-temp ASAP, right? So why not an exhaust brake? Most, if not all of the benefit (and others besides), but without the complications of another "cooling system". A KIMM Hotstart plus an exhaust brake plus a MOPAR winter front covers a lot. (Silicone heat pads for the rest). An ESPAR or WEBASTO otherwise.
The exhaust brake -- to expand on this -- goes directly to best & highest use as the DODGE Bodybuilders Guide states that this device is pretty much a necessity for towing trailers in excess of 10k pounds. I plan to have one on my CTD in the coming calendar year.
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