My 18 came with the engine brake...there's a good chance yours may have it...all you may need is to add a switch and programming. My buttons are top center on the dash, just over the Navigation screen.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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