So basically I have a 2014 c250 coupe that’s my daily I was just looking to throw some nice rims on, my issue is that owners manual says 8 (in the front) and 8.5 (in the rear) is the widest I can go s, I was looking to do 9-9.5 in the front and 10-10.5 in the rear. So I guess my question is What would I have to do to get the size I want without breaking my daily? lol

Is yours rwd?

Anyways I have 8.5 front and 9.5 rear and I'm 4matic, never heard this issue and never had one

Really I wouldn't go wider, the stance won't get much better than that, it'll start to look bulky and you'll car will get weighed down a lot

what size wheels? And what’s you’re offset?

19", +42 front +50 rear

But a coupe might have different offsets

Watch your front tire diameter, there's only a few MMs clearance below the spring perch so that's a critical dimension.