You won't get a tighter steering ratio or faster steering with the Sportline unless you buy the Sportline steering parts, which I didn't do. My comments on steering may have been misleading. I have better road feel and the car feels more responsive, but nothing was done to the steering, still the same stock # of turns on the wheel, and the same ol box. Just feels 'better'.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E