Found a good deal on a set of used Vossens CV7s but I'm trying to figure out if they are too aggressive or not. I'm currently at stock height on my 08 g37 coupe and am thinking about buying a set of springs but I'm not sure yet. The specs of the wheels are 19x8.5 +20 and 19x10 +40. I don't want to run any large amount of camber and would like to fit a meaty tire if possible.

 

Those are decent offsets, you could run 245/40 front 285/35 rear tires, just need to confirm the wheels will clear the big sport brakes (I assume you have a sport based on your username).

 

 

Fronts will be 23mm out from your stock wheels (assuming you still run the OEM 19s), so measure out that much and see what you think. Should be right at the edge. Rears will be out 17mm from where you are now.