Hey Joe, also, unfortunately, the front splitter (black part below the bumper) looks like a Series 1 or 2 (like mine was). The Series 3 has a deeper front splitter with larger brake cooling ducts.
As above I think the N1 ducts were an option from 1995 (I have a Japanese brochure which shows them as part of the accessories I think) but every S3 I've seen has them.
Does your car have red trim (fleck) inside, or blue? Blue = S1 / 2, Red = S3.