Nissan 200SX Forge FMDVF005 Piston RAM Valve | Dump Valve

Suitable for most Turbo cars without an Air Flow Meter

Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound most commonly associated with rally cars when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. For applications where the valve may be subject to dusty conditions a filter is used to prevent particals entering the valve.


Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.

Dual-Piston Atmospheric Valves and Valve Fitting Kits

All Forge Motorsport Dual-Piston Atmospheric Valves have been designed and built with the intent of venting 100% of the residual charge air remaining in your forced induction system to the atmosphere at throttle lift.


Forge are known for great quality performance products, being an authorised dealer allows us to offer these products at the best possible prices.


Reasons to choose the Forge FMDVF005 Valve

• Genuine Brand New Forge Motorsport Product
• Choice Of Polished Silver Or Anodised Black
• Counter Balanced Springs
• 1 Year Guarantee
• Free Worldwide Delivery

While Forge have incorporated many elements into the design of the Dual-Piston valves to aid in their compatibility with mass air-flow sensor equipped vehicles, we cannot always guarantee that each individual’s application will be compatible with a valve that vents the charge air into the atmosphere.

We have been supplying our customers with high quality car modifications for several years now, our experienced staff are here should you need any advice or guidance.


High performance Forge products as used in most motorsport cars are ideal for modified, performance, race and custom vehicles.