Tein Street Advance Z Coilover Suspension Kit - 3 Series Touring (E91) VR20 53540-S04-013 With the low-maintenance design

With the low-maintenance design

Pro Series Valve Springs and Titanium Retainers originally designed for B Series engines

which was not possible before

making them the perfect upgrade for tuned

Tein Street Advance Z Coilover Suspension Kit - 3 Series Touring (E91) VR20 53540-S04-013 With the low-maintenance designMuch like Tein Street Basis, Street Advance utilises a twin tube system and has adjustable lowering spring seats allowing you to adjust ride height. Unlike Street Basis, it also features adjustable damping force, allowing you to effectively change your handling characteristics. Compared to mono tube suspension, Street Basis is twin tube, meaning it attains a longer stroke with a smaller repulsive force, resulting in excellent high ride comfort.