Both DLC packs now on sale for $11.98 and are playable for the Xbox One and PC versions of Forza Horizon 4.
(Full game sold separately)
Don't forget to nab Forza Horizon 3 before 28/09, as it'll be delisted by then - only $13.18
Previous discussion on this
Is the Lego one worth getting? I do love lego and forza horizon, but is there enough depth?