Griffith CAT's, how many and passing emissions test without?

[black_potato]

Hi,

I will be a few months away from from an MOT when I pickup the Griff and my biggest concern is emissions..
The current owner of my intended car purchase claims the car passes MOT's as is but I'm not convinced.

Question 1....
My assumption is there are normally 3 CAT's, 1 in each 4-1 Manifold (The pre CAT's) and 1 in the Y piece
(https://tvr-parts.com/tvr-parts/part-details/tvr-s0160/exhaust-y-piece)
Are there any more ?

Question 2....
Which ones do you normally need to pass MOT, maybe the Y Piece is enough in most cases ?

Question 3.....
Can you realistically meet emissions requirement without a CAT. In my case I will have an Emerald ECU so will have a lot more tune-ability than most so if anybody has specific experience of passing with an Emerald and what is required that would be great. If the answer is no.. You have tried and failed that is also very useful.

And.. Question 4 if I maybe greedy.
How robust are the Y Piece CAT’s. I have been offered a 2nd hand one but I’m a little wary that it will be effective.

TIA

Richard

[black_potato]

Thanks QB. At the moment I belive it has a ACT decat setup. Manifolds and single piece Y section.

I have a couple of months to get it worked out. MOT is end March I believe.