I dont suppose you were the guy that had a talk with the guys at Manayunk Triumph regarding clip-ons for the S3 were you?
I was there picking up a few bits and pieces and was asked about the ones I had on mine. I suggested the Tommaselli's I saw on a pic by a fellow forum member zmann;
check out his album..hope he doesnt mind my promoting his album...
I have the WoodCrafts (
www.woodcraft-cfm.com), they are the easiest to install as the clamps are two piece and so does not require that you remove the top clamp at all but they are very, very aggressive; they mount any you must commit to the crouch.
Perform a search, there have been a few threads with involved discussions and pics of '05 S3's with clipons.
Aikojo is another member that found a solution that made the LSL clip-ons (
www.spieglerusa.com for clip-ons &
www.jacklilley.com for LSL headlight and instument panel fork mounts) work with the S3.
Good luck, I lovemy bike with clip-ons but be forwarned, you loose the comfort and supreme agility you have with the bars.