Recently purchased a certified used 07 Audi 3.2 Quattro with 245/40/18 m-s radial tires - no car manual. The m-s meets snow tire classification and the AWD of the Quattro has me covered by law. However, California law says chains must be 'in the car' in chains-on areas of the mountain passes - and our mountains are getting dumped on right now. Without the manual, I don't know if chains CAN be put on the car. I've read threads elsewhere that says it destroys the wheel well, rims, etc. Looking at either the (not cheap!) Premium Self-adjusting Snow Tire Chains by Thule K-Summit Size K33 w/ 0mm clearance or (more reasonable) Thule 9mm CG9 Premium Passenger Car Snow Chain, Size 102 w/ 9mm clearance. I went to the nearest Audi dealer to ask but the young New York transplant looked at me like I was crazy and 1) didn't answer if chains COULD be used and 2) said my tires and the Quattro alone would be fine. I'm close to buying cheap $35 chains just to meet the 'in the car' law and never use them but would like to not skid off the side of a mountain in the process. Advice? Thank you!