What is the correct offset for the 997 C4S wheels? I am looking at a set of 18"s and want to make sure that they locate correctly with the factory spacers. Thanks for any input.

 

the rears are 19x11 with an ET51 offset. The ET51 offset will change if you change the width of the rear (i.e. if you go with an 18x10 instead of 18x11, you will need something different). Fronts are the same for 2S and 4S cars (19x8 ET 57).