I have had all three, the air, the normal, and the sport. The sport comes on the R-Line trim line which was available in the U.S. for maybe one year (2014), not sure on that...

The sport might be slightly stiffer, hard to tell because the R-Line has 20 inch wheels compared the to 18s on my 2012. It definitely does sit about 1-2 inches lower. A 2014/2015 happened to park next to me the other day and it was quite obvious that my R-Line was a bit closer to the ground.

Overall ride quality though, it would be hard to tell the difference unless you took it to a track and threw it through the curves. As a daily driver, it might feel a bit harsher on bumps with the sport suspension but the 20 inch wheels probably add to the harshness.

 

Thanks a lot. Since the two suspension parts numbers are almost same, I think there isn't much difference. I guess only the springs are different to lower the overall heightt.