Nops, but sports suspension which is 15mm lowered than the standard one. Sline is 25mm.
The Prokit drops the car by 30mm on stock height (non sport suspension). So, in a nutshell you should get an extra 5mm drop on your sline suspension. My neighbour has an 8V sline and I can confidently say that mine sits slightly lower than his’.
Having said all that, the drop is all down to personal preference. I don’t like a bagged car, plus the A3 is driven by Mrs most of the time and therefore I am quite happy with how it currently sits.