1、This is designed specifically for all 1.8T and the 2.7L engines, will also work on other cars measuring at 25mm/1in inner and outer diameter. 2、The splitter valve is a remarkable valve that gives a combination of blow off and recirculation valve operation all at the same time. 3、Has been specifically designed for the many turbo engined applications that operate metered airflow management systems. 4、You get all the noise of the blow off valve whilst retaining the compatibility with the recirculation requirements of the engine management system. 5、The splitter valve is also adjustable to suit your engine and can be converted to be totally recirculating if you ever require a stealth approach. Developed for the 1.8/2.7 turbo applications. Item Type: Blow Off Valve Material: Aluminium AlloyThe Valve is Capable of 3 Different Setups: 1. Hybrid: Atmospheric AND Re -circulating Operation 2. Re-Circulating Mode 3. Atmospheric Mode Precise Adjustment of the Splitter Hybrid Valve is done by turning the ratchet type cap adjustment knob located on the top of the valve. Turning the knob clockwise will stiffen the spring for higher levels of boost retention, while turning the knob counter-clockwise will loosen the spring tension for lower levels of boost retention. Fitment:For 1.8T engine For 2.7L 2-turbo engine (2.7L engine requires 2 BOV per vehicle) It is also suitable for other cars with an inner diameter and an outer diameter of 25mm/1in. 1 x Blow Off Valve 1 x Vacuum Hose 1 x Fully Recirculating Plug 1 x Inlet Pipe Plug 1 x O-Ring