I would like inputs for a 19 inch wheel set up on a g37x sedan. Mainly on any necessary alterations to make it fit. Also the pros and cons. Thank you

 

Fitment would depend on the width and offset of the wheel. 19" wheel setups are common on G37 sedan awd and rwd. you can also runa stagger setup as long as the overall diameter of the front and rear are the same or very close.

19" is a good balance between looks and performance (enough sidewall to have good road absorption but still stiff enough for good response.) only down side compared to 18" is tire cost and selection (18" are cheaper and have a better sizing option)