Our cats have the Powervalve logo on now...
So the early ones didn't @Powervalve Nige
All of our cats are 125mm in dia and logo'd either BCS or Powervalve.
If there is no logo it is not ours.
There are other distinguishing features on our Downpipes aswell which confirm our manufacture.
Let me have a picture of what you have and I will confirm it.
Cheers
Nige