You're in a Volvo forum, so expect that people are gonna choose the EX40 :ROFLMAO:
But it really boils down on your needs and preferences though. There are lots of reviews on YouTube that you could watch. Try having a look at it.
How long have you had your C40?
It'll be tough finding something for newer models of Volvo. Have you tried checking with your dealer? I've read this issue before and seems like most of the C40 owners can;t find anything.
Maybe you can start with the Carly Adapter. It's capable of accessing...