We recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner This is a piston design bypass valve that is a direct replacement for the original fitment. This valve gives greater longevity than the diaphragm (OEM) valves but also benefits from its ability to be fitted with different springs when the boost pressure has been increased or the engine has been modified. Please note that if your vehicle has the valve show in Figure 1 then this valve will fit your application, however the valve shown in figure 2 will not be compatible with the Forge valve. To avoid the possibility of a P0101 trouble code, the ECM must be reprogrammed with a tune optimised for atmospheric discharge.In The Box: 1 x FMDVCS14A Valve 1 x Uprated Yellow Spring 1 x Forge Sticker. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Air Intake & Induction\Dump, Bypass & Blow-Off Valves". The seller is "wg_motorparts" and is located in this country: GB.