I installed a Blueflame exhaust with race cat a year ago and now was the first time to test if it was okay.
I arrived 11.00 at the MOT building. At 11.20 my registration number was shown on the board and I drove inside the building. They checked emissions but it didn´t pass . The cat was too cold. I started to think that maybe the cat was a piece of *hit. The MOT guy told me to get in the car. "Lets take this baby outside for a spin" he said. After driving around the MOT building for a while he checked the car again. It passed!!!
So all you people out there that uses Blueflame with Motorsport cat. Don´t worry, it works

They do need a good warm up but this can be done in the MOT station on idle. Me thinks he just wanted to see how it went.

I think so too
He drove around and around and around with a big smile on his face. But I don´t care. He propably inspected a lot of Volvo 740 all week so this was the first funny car of the week