I have 18" stock wheels on my 2008 G37 and want to change to 19". I have a chance to buy 4 Koing wheels for $300 and they are almost new.
The size is 19x8, bolt pattern is 5x114.s, offset is +40. Will this offset work OK? Recommended tire size?
Thanks.

 

It will be super tucked.... and imo the stock 18s look better than these

 

To answer your question, yes it would work
IMO keep the stock wheels till you can find a better upgrade