You are purchasing a full set of 4 (2 front & 2 rear) offical Pi lowering springs for your AUDI A3 3 Door 2.0 TDi (not S-Line or Quattro models) 2003> designed to lower the ride height by 45mm. To accommodate all of those variables, your cars suspension had to be tuned for average conditions, acceleration, braking and cornering.
eBay