sports and sline suspension

allyli, welcome to the forum (from a relative newbie, but welcome nonetheless).

Check out the search function: it will bring you loads of information.

afaik, sport lowers 15mm from standard, and S-Line lowers another 10 from that, for a total of 25mm lower than standard.

Standard, Sport and S-Line each have their own spring, damper and anti-roll bar specifications, but they all share the same suspension design and geometry.

Seriously, do a search and you'll get loads of interesting reading ;-)
 
I've just been to a dealership, and the ride height of a s-line and Sport seem to be the same. Although the gap under the wheel arch does look larger on the Sport, the wheel arch and door mirror came to the same height on my body. OK, not an accruate way of measuring, but still I'm sure I would have noticed a 10mm difference. I'll take my spirit level and tape measure next time!
 
One way to find out is to check the coloured dots on the springs for each car. I have had three versions of TT suspension (Quattro Gmbh, V6 & Original) and all have different colour codes.

Steve