Adjustable valve for exhaust?

[RemixZ]

Hey anyone ever make an adjustable valve (think water faucet) for exhausts? Was talking about it with my co worker today...Be fun to tinker with especially if you could hook it up in the drivers seat somehow...I was thinking the ypipe to exhaust location.

[Retired Chief]

Bypass valves have been around for a long time. Some are hooked up via cable from the dash so you can operate it from the driver seat. It's usually installed right after the headers/exhaust manifold so when it's open it bypasses everything else - ie CATS, tubing and muffler. It used to be pretty popular on muscle cars but I've only heard of 1 Z owner who had it.