Mk1 Focus RS - Zetec Blacktop + ST170 AREA6 Up-rated Valve Spring Set Transmission The Silicone hose is supplied

The Silicone hose is supplied by ROOSE and is available is Gloss Black or OE Black and in either standard length or +50% (300mm)

By expanding the dynamic range and rate of response of your OEM controller

Why Buy this Bonnet strut kit

Finished in Anodized Blue

Mk1 Focus RS - Zetec Blacktop + ST170 AREA6 Up-rated Valve Spring Set Transmission The Silicone hose is suppliedTurbocharged and performance engines require more of a valve spring. The pressure within the intake valve is Boost pressure, and this acts upon the valve head, significantly reducing the valves seat pressure as the boost is trying to push the valve open. The same impact occurs on the exhaust valve head. Whilst Ford provided the Focus RS with a mildly uprated spring set to suit the turbocharged application, these become ineffective after 20psi boost,