The reason I went w/ this valve is it's ability to hold much more boost w/o leaking. For example: my friend has an evo who was boosting at around 26psi on the stock bypass valve (alky inj.). Once he replaced the valve w/ an APS unit his boost immediately shot up to 30psi (shows how much the stocker leaks). He now holds 26psi to redline, when it would taper much more on the stocker

 

bizzzup for more valves on the shelf