I am looking at the ZR1 replicas. I know it says on their website that either offset will work on the Firebirds, but wanted to get opinions as to which looks better. It says the +38mm offset will stick out further than the +56mm. Anyone have any pictures of both or know how much of a difference between the 2 there really is?

 

You might want to try a "search". This subject gets covered frequently.

This is my car with the 17x9.5" 56mm offset AFS polished replicas in the front:

http://cjcfo.fbody.com/members/injun...C/Rr34Dr02.jpg
http://cjcfo.fbody.com/members/injun.../DCP02781d.jpg

56mm - 38mm = 18mm = 0.71"

That's how much further the 38mm wheels will stick out.