It does
I bought one for CHEAP a few months ago, its on my auto mod'd stagea atm.
stnd bov got "repaired"
and now that Im on holidays, as of like 1hr ago, Im going to take off the FULLY ADJUSTABLE gfb stealth-fx bov (worth $550 new)
and put back my fixed stnd one
my mack truck is about stealth not sound
contact me if you want it for what I paid for it
I used it on full plumb back and full spring tension, works real nice and sounds, well, funny.
a few test runs would sort out what sort of atmo / pmub back percentage mix works on your car
its not my kinda thing, I got it to hold boost pressure, but Im going about that little quest a different way now so I have no need for this as of next week.
but if you are into bov's, then the GFB stealth fx is worth a research matey