If so, what thicknesses front & back? And what are your observations regarding handling/turn-in/tracking stability?

Thanks in advance.

 

I used 10mm ecs tuning only in rear and it looks great. Finally fills out the rear wheel well. I put the spacers in the front but made it stick out more than the rear so removed them. I have 20"spider rims with spring non air suspension. Perfect set up. For a clean stock look