For a 3k cash rebate, it is more worthwhile to stick with the
loan. For other figures, need to know details for
calculations.
And only tell your SE about the loan you intend to take after you
want to conclude the deal. Meaning you have already gotten the
freebies you want. Anyway 50k is alot to loan, and they will
definitely benefit from it. So just ask for all you want, if not
sucessful can just walk out.
The usual stuff are leather, sport rims, solar films, alarms and
thing like that. Spoiler and sporty visor, also can if you are
good.