Bike silencer

[Enoch]

I have a Micron exhaust on my car, It is a bike one but I have no idea which bike it is for, I picked it up at an auction for £2
It is louder than the packed Caterham one I had on the car before but when held at a set number of revs (as per the IVA test) it is quite reasonable. It's when you rev the car that it barks somewhat. I have not got a db meter yet, I intend to buy one soon. My gut feel is that it will pass but not by a big margin. It looks smart and all the edges are rounded, it will pass the radius tests without modification, I could not say that of the Caterham one, hence the change. If it is too loud I will insert a pipe that is a tight fit in the exit pipe and is 2/3 the length of the chamber. This should bring the noise down without causing much restriction.
Enoch.