It's time to replace one, and might as well both, of my catalytic converters. Normally called cats, but that would get confusing on this forum as shorthand for our cars themselves, so thanks, Jaguar! And my regulatory government! For making me having to type that out. "Don't ewe mean a Cadillac converter?" Oh, Lord. When I come to power, it's straight pipes for everyone.

At any rate, one of mine has since worn out, to the point of being hollowed out where (according to our very own motorcarman on my last visit earlier this year) you can look from the upstream end and see the downstream O2 sensor. I'm told I need a 'flange style' replacement. What are my options, especially for something more of the high-flow variety that won't trip any codes? I'm hoping the dealer isn't the only option here. Timeline is within the next 60 days.

P.s.: When I get them swapped on, I'll also finally be doing the center H-pipe, small baffle box removals, under-axle exhaust routing, and re-hookup to the stock mufflers upgrade.

 

There are a few options but Nameless Performance seem to be the popular ones on this forum.

2000-2002 Jaguar XKR/XJR/XK8/XJ8 Downpipes - Nameless Performance

Not exactly cheap, but from what I have heard they are well made.

They are built around an magnaflow aftermarket cat, so theoretically you could fabricate your own.

 

I have a set of the 200-cell version from Nameless Performance. They are high quality and I have not had any problems passing emission inspections with them.

 

Excellent- the Nameless units were the ones I was trying to think of that I recalled perhaps you guys talking about on here in the past. Those are the ones I may go with. Much appreciated.

Any other considerations?