Anybody using one of these?

You run a cable into your car and can adjust the flapper door on the fly.

I have a 80mm turboback, except for the 2.5" cat, corksport exhaust and it's stupid loud without the silencer. And still a little loud with the silencer.
So I figured this would be nice because I could adjust the noise level on the fly.

Ed

 

pic I ordered the 80mm pipe type like this.

 

An s2000 friend of mine uses an electronic version to control whether he is using his mufflers or not - so at the track he opens it up and it gives him some more flow.

 

So he put it on a Y pipe open dump.

Anyone used it inline with their exhaust I'm curious to see how much it can quiet the exhaust.