Tein Street Advance Z Coilover Suspension Kit - Impreza GC6 Valvetrain As modifications are made to

As modifications are made to optimise engine performance

The Zero Bump Steer Kit corrects the angle of the lower arm and inputs cornering force to the vehicle body at the appropriate arm angle

The Idle Air Control Valve

The 4-point type is for circuit driving

and a head twice as big as in the conventional products of this type

Tein Street Advance Z Coilover Suspension Kit - Impreza GC6 Valvetrain As modifications are made toMuch 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.