Thanks for the nice overview of manifolds. Meant only as a supplement, I said it before. If someone lives in a country with strict MOT controls where a 200 cell cat is not enough, then I recommend on the one hand to keep the fantastic sport manifold but that someone swaps his 200 cell cat for a 300 cell cat. In my case it passes every test and I have not had a yellow engine check light on in 7 years.
One more point Dave, it is quite possible that your new HJS cat will pass the test even with 200 cells (when warmed up) because I suspect that it is rated at a slightly higher liter output from the engine than was the case with the Plus4 SS for example.
