Eibach 4.10515 Sportline Performance Spring Kit: Automotive. Buy Eibach 4.10515 Sportline Performance Spring Kit: Coil Springs & Parts - ✓ FREE DELIVERY possible on eligible purchases. Extreme performance meets extreme style . Race-car like handling . Lowers center of gravity and lowers vehicle 1.7 inch - 2.3 inch . Stop quicker, corner faster and get better MPG . Progressive spring design for excellent ride quality . Sportline is the extreme performance spring set created for the extreme enthusiast - the one who craves a race-car attitude for maximum street performance with the lowest possible drop, but with the exceptional ride quality you expect from . Engineered with the same care as Pro-Kit springs, Sportline springs achieve legendary handling by aggressively lowering the center of gravity of your car, using precision-engineered progressive spring rates. By radically lowering the center of gravity, Sportline springs dramatically reduce squat during acceleration, body roll in corners and nose-dive under braking. By using the proprietary from and progressive spring design, Sportline springs provide the ultimate balance between high performance, extreme lowering and comfortable ride quality. When combined with the wild 8 inch, 9 inch or inch wheels and tires of today, the result is a car that handles just as white-hot as it looks. . . .