IE Lowering Springs For B9/B9.5 Audi A4/S4

The factory suspension geometry on the B9/B9.5 Audi platform was calibrated for broad market appeal — not driving precision. iE’s platform-specific lowering springs correct this with a calculated drop engineered specifically for this chassis, eliminating the factory reverse rake, reducing body roll, and sharpening the car’s handling balance across A4, S4, A5, and Allroad variants. A progressive spring rate delivers both performance and everyday livability. 

FEATURES 

THE SCIENCE OF STANCE 
iE engineers calculated a platform-specific drop that doesn’t just lower the car — it corrects it. Eliminating the factory reverse rake produces a flush, level fender-to-tire relationship that looks right and improves aerodynamic balance. Aggressive without sacrificing the real-world ground clearance that daily driving demands. 

STAY FLAT. STAY STUCK. 
Body roll is the primary enemy of grip and corner confidence. iE’s carefully tuned spring rates keep the B9 chassis flat and planted through high-lateral-load corners, maintaining consistent tire contact and predictable handling behavior at the limit. 

ONE SPRING. TWO PERSONALITIES. 
iE B9 lowering springs use a progressive rate — compliant and smooth over road imperfections at everyday speeds, ramping to a firmer rate under cornering loads. The comfort and compliance of a daily driver. The body control and precision of a performance chassis. Both, from one spring. 

SET AND FORGET 
Chrome silicon alloy spring steel with a premium corrosion-resistant coating. Designed for long-term use without spring sag or rate loss. Compatible with factory OEM dampers. No coilover upgrade required. 

THE SPECS:
* Drop: Calibrated Sport Drop of Approximately:
A4 S-Line: ½ Inch Front, 1 ¼ Inch Rear
A4: 1 ⅛ Inch Front, 1 ¼ Inch Rear
S4: 1 ⅛ Inch Front, ⅞ Rear

* Spring Rates: Performance Progressive Rate of 558 lbf/in Front, and 515 lbf/in in the rear.
* Material: High-Tensile Chrome Silicon Spring Steel