General description maXpeedingrods B1 series coilovers are designed for Audi A4 B6 & B7 Avant Estate models from 2000 to 2008. This suspension lowering kit is perfect for those looking to replace old struts while enhancing handling performance. The kit features height adjustability while maintaining the original equipment (OE) ride quality. Technical specifications Height adjustable: Yes, lowering range 0-25mm depending on vehicle model Spring rate Front: 6.5 kg/mm (364 lbs/in) Spring rate Rear: 10 kg/mm (560 lbs/in) Spring length Front: 295mm Spring length Rear: 208mm Front spring inner diameter: 70-71mm Rear spring inner diameter: 42-46mm Spring preload advised: 7-10mm Quantity: 2x front coil-overs, 2x rear coil-overs, 2x C spanners Compatibility and accessories Compatible with AUDI A4 Avant 3 /1.9 TDI /1.8 T /2.0 FSI (2000-2005) (8E5, B6) Compatible with AUDI A4 (11/2000-12/2005) 1.8 T for quattro /3.0 for quattro (8E2, B6) Compatible with AUDI A4 Avant 1.9 TDI/2 /1.6 /2.0 TFSI