sierrafery said:

Maybe not relevant for this topic but afaik only 15Ps had factory fitted catalyst

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Could be, maybe I have them mixed up? been years since I owned a td5, 2001 td5 es premium, really liked that car, one of the few that I actually think about now and then.

Sieklo said:

But there will be a drawback, your EGT will go up it will act as a restriction in your exhaust, you have boost pin and ring, adjusted pump so your EGT’s are higher than stock ones so with additional restriction (that will be a cat) it will put more thermal stress on turbo and engine internals.

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Jayridium said:

But, yeah, you'll get the results you want, scent-wise at least However, since you're introducing a restriction to the exhaust that wasn't there previously, you might want to look for a bigger cat than you'd expect to use on a 2.5 diesel, with the aim being to minimise the adverse effects on performance and economy.

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Kenbo said:

Try a company who specialise in catalytic or emission treatments, they might know of something.

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Thanks a lot for all the replies; it was exactly the kind of input I was looking for. I'll be speaking with a company that specializes in catalytic converter installation, but I wanted to get some insights from other Land Rover owners first. Following your suggestion, I plan to install a bigger catalytic converter to ensure that the exhaust fumes can leave the engine freely. I have an EGT gauge, so I'll be able to monitor my exhaust gas temperatures—hopefully, I won't melt my engine

I'll get back to you with the results. I also plan to measure my exhaust emissions before and after the installation and will share the outcome with you.