Budget-Friendly Mods for '07 Mustang GT Coupe V8 Manual/Standard?

[Armen]

Just my personal opinion, but I think 18's are too small for S197's. They have some big wheel wells.

[Stephen06GT]

Just my personal opinion, but I think 18's are too small for S197's. They have some big wheel wells.

How does changing the rim size affect the overall size of the wheel? The OD of whatever size tire you put on the new rim should be within 2% of the OEM size. There is no gain.