Some Pictures of my Open Dump 02 Housing
The open dump setup WORKS. It will add power, especially torque when the boost hits. To have this mod done correctly though, you of course have to separate the wastegate chamber from the turbine exhaust chamber (common sense really), but Im sure some people would just cut a hole in the 02, weld on a pipe and call it a day.
Dyno? No. I had 60k miles on my car when I got it done, I knew the car inside and out. There was a very noticeable torque increase. Try and find a faster pump gas only stock turbo car. Youll find one thats gutted and thats it. Tgats proof enough for me and the countless number of people ive helped go faster. Of you dont want to listen, by all means dont.
.... ill convince anyone lol
about how much louder does this make your car, percentage wise? Just a seat of the pants estimate will do... A 150% increase in sound, for example, will be very detrimental to po po situations.
As far as state inspection goes (different states may very) This will be considered an exhaust leak. Screw it though. Before you go it, figure out a way to cap it off and don't hit full boost on the way to the inspection station. And tell the tech not to hit full boost, and explain why. As long as the exhaust is not "leaking" and "capped off" it SHOULD pass. Take off the cap for the ride home and you'll be good.
No idea how you'd "cap" it though
Actually, in all honesty, a tech probably wouldn't even think twice about it, and not know what it was, but who knows.