Which Blow off Valve to use

[strangesvo]

Starting to gather parts for my front mount IC install.  I currently have a stock set up with your Bybass Valve (single piston recirculator).  Can I run this on the front mount piping by using the silicone coupler you sell and dump into the atmosphere?  Or do I need to purchase one of your blow off valves listed?   As I read the description of both blow off valves it looks like I can use either.  So the difference is? Looks like l need to weld in a bung for one and the other I can use the coupler you sell.  Just wonder the best option for my set up.  Both are priced the same so not sure how to decide.

Running the pimp XS

Thanks

[Stinger]

With a PiMPxs there is no restriction for which valve is required from an ECU standpoint.

From a functional standpoint, dumping a bypass valve to atmosphere (with our ECU) is fine, except that it will likely be open at idle, allowing some unfiltered air into the engine. That valve doesn't have adjustable preload since it being open at idle isn't a concern when it's used the way it's designed (recirculated). If you don't want to recirculate your bypass, and don't want to let unfiltered air in, then get one of the other valves. As you stated, dual piston uses the same connection as the bypass (1" hose), RFL is a weld-on bung with o-ring seal.