You can option 5-lug-wheels on a Turbo S.

The most distinct difference besides the badge are the brakes. The regular Turbo comes with steel brakes as standard while the S features the carbon ceramics from factory. So if it had ‘small’ brakes with red or black calipers, it was a non-S.

Apart from that, if the owner didn’t order sports-exhaust, the quad exhaust-tips on a Turbo are finished in chrome, the ones on the S are finished in black.