I am in the Uk. I may have to replace one of my Catalytic converters soon. Problem being my car is a 2003 XKR. You can buy alternatives for 2002 and older but, non Jaguar made, replacements for younger models are not made, apparently. Legal ones.

Unless anyone knows any different?

 

That is a no then?

 

I am unsure what qualifies as legal in the UK when it comes to emissions but there are some high flow cat options available. You could also have a fabricator make up a replacement using aftermarket parts (which is what the high flow performance models really are).

In the US such things are legal depending on locality and age of car.