Found this, makes me wonder if this is similar to the system that the GTO's have fitted which adjusts exhaust pitch to be stealth or "Oi, I'm coming down the highstreet, look at me!" mode.

 

What do you guys think?

 

Check it out here...

 

Wouldn't mind one of these, not just a gimmick but a) stand a better chance of passing the MOT and b) draw less unwanted attention to yourself from Plod! Group buy?

 

that looks cool , i wouldent mind one for those days you just want to putter around