The bottom line here is that you want to outside diameter of the new minus one winter tires to match up with the outside diameter of the original tires supplied with your car. You can go to any number of online tire retailers and perform the calculations on their web sites to make sure that you get a match. It so happens that the 17 inch tires supplied with the Touring model match up almost perfecty with the 16 inch tires supplied with the LX and EX models. By going with a taller but thinner tire with the correct outside diameter, you should get better road grip in the winter and still avoid confusing the onboard electronics that are expecting the OEM recommended tires sizes.
