i saw the vid & read the info about the new muffler w/ this valve. just wondering if the valve opens up becuz of pressure, springloaded valve, or if a sensor feels the backpressure & electronic/hydraulic opens this valve.

does aftermarket muffler improve power or is OEM best? on VQ30-K motor. i tried lookin back at threads & cannot find any info. THX

 

It opens the second valve when enough pressure builds up.