A WORLD FIRST in blow-off valve technology, the Deceptor Pro is based on the patented volume adjustable Stealth FX blow-off valve, but advances the design even further, featuring an industry world first: electronic proportional in-car adjustment of blow-off valve volume! It is no longer possible to cruise the street with a permanently noisy blow-off valve - the Deceptor Pro lets you choose when and where you are noticed!