I've got the 363sxe, on a 14 with dual fuel.
I can tow in 6th locked, and never downshift, as long as I go a fairly decent speed. 70mph I can tow anything in 6th no matter how heavy, 65mph, it has to be heavy to keep the turbo up all the time or when you go down a hill it'll unspool, and can't pick back up at the bottom of the hill and smokes like a train. Pulling big, heavy stuff it keeps the turbo spooled even going down hill so it's not an issue.
Honestly a dream combo, I think I'm going to leave the 63 in the valley and throw on the compound kit with some 60% nozzles and an engine build and enjoy it. Might still limit it to 750hp, but it'll tow like stock, but with a chit load more power and cool EGTs. I couldn't be happier.
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