I saw a Cadillac with whitewall tires today. Don't you wish they would make a comeback? (the tires)

 

  Owing to the fact that your first line has sentence-ending punctuation, the second sentence is completely independent of it, therefore, its first word should be capitalized.

Uhhh..... no.  

Back in the 1990s, I had an orange Nissan pickup.  When it came time to replace the tires, the ones Big O Tires sold me ended up being white walls.  (Uh... I don't think so!).  I had them flip the white to the inside. 

Yeah they should make a comeback they look pretty cool plus they somehow make a vehicle go faster (sort of like how chrome somehow makes vehicles go faster). I bet with all the new cleaning products on the market it would be easy to keep the whitewalls looking clean. Cheers!
 

NO

Whitewalls look great on those old car designs.  I don't think I would like them on the newer, more modern cars.