Unless you paid wayy over sticker and they really like you. Talk to the GM and maybe he can sort something out for you.. Remember if it's a smaller dealership then for sure no but if they have loaner cars laying around then yes..
2008 M3 Sedan + catless + Tune
2012 CLS63 AMG
2014 M6 Coupe + catless + KW V3
2015 Porsche GT3