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Forge Motorsport Type RS Dual Piston Dump Valve The Forge Type RS-A Dual Piston Ram Dump Valve A diverter/compressor bypass/blow off valve should be part of any intercooled turbo system, especially if they are making more than 4 or 5 pounds of boost. While many people buy valves because of the sound they make, they also serve a functional purpose as well. When you are at load and the turbo is building boost then you let off the throttle, the pressurized air column encounters the closed throttle plate and like a ball hitting the floor, it bounces back towards the turbocharger. When this column of air reaches the turbocharger it bounces back to the throttle plate. This can actually be very violent and cause the vehicle to "trailer hitch" at part throttle cruising. Trailer hitching is a jerking of the vehicle, called such because it feels like a trailer is behind the vehicle jerking it about. Not a pleasent situation. Another reason for a diverter valve is because that air column that travels back to the turbocharger creates a significant load on the compressor and turbine parts as this pulsating force tries to stop the wheels. People have actually broken the shaft in the turbo because of this! Finally diverter valves are good for performance, since between shifts the release of pressure in the intercooler piping allows the turbo to stay spinning. Without one, the turbo loses a significant amount of speed each time you shift gears, requiring it to spool back up. Forge Type RS-A Dual Piston Ram Dump Valve Specifics: This is one bad bad bad valve! The Forge RS-A valve has been specifically designed and engineered to offer extreme flow rate capability where other valves are just not up to it. Often when engines have been tuned by installing larger turbos or even software upgrades improved turbo response can be acheived by fitting the RS valve which has the greater internal mass air flow specification utilising an amazing 50mm (2") bore. For fine tuning there is a variable spring preload incorporated and a ratchet type top adjuster that will allow for the positive and precise adjustment that your driving style demands. To ease installation a 360 degree adjustable vacuum hose connector With a choice of inlet and outlet connections the RS valve can be matched to your engine perfectly. This valve incorporates a unique conical, progressive rate spring that can allow for the retention of boost pressure from 7 to 34 PSI depending on the individual user's application and level of adjustment. This unique spring design will also allow for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring. Other manufacturers valves using cylindrical springs with adjustable pre-load often experience restricted piston travel and flow volume within the normal range of valve adjustment. Please note: When configured as a Dual-Piston Atmospheric Valve "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. While we 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. Forge Motorsport nor any of it’s Authorized Distributors can assume any responsibility for any adverse effects resulting from the installation of this valve onto a vehicle whose engine-management-system, whether factory or aftermarket, is not capable of compensating for the loss of metered air through a vent-to-atmosphere valve such as this. Dual Piston Design. No diaphragm to rot out and fail. High strength body resists breakage Spring Tuning Kit- Includes various springs and shims to ensure the valve stays closed and does not leak off boost pressure. This is a dump/blow off valve. All air released from the valve is blown off to the atmoshphere resulting in an exhilerating "WOOOOSH" sound. GREAT LOOKS! Available in highly polished and anodized black! Dual Piston design makes it safe on most mass air/vane air equipped vehicles. These valves will stay closed at idle and light throttle cruise(unlike signle piston valves). If your car will run right venting boost(Turbo 2.3 Fords will, late model VW will not), this make work for you. Connects to any 1"(25mm) or 34mm diameter hose with hose clamps. LIFETIME WARRANTY!!! Click Image Below For Full Size MSRP: $230.00 Max PSI Racing: $205 shipped in the USA Color Polished Silver Black Anodized Inlet Size 25mm 34mm