A sad indictment on our throw away society.
Secondhand KV6 manifolds are out there if you shop around £100 upwards. Plus approx 1 hour labour to fit. You may also have to replace the VIS motors on the manifold so allow approx £100 for a pair of VIS motors too (actually they can normally be repaired as per suzublu post for much less, but it depends on your technical abilities).
Same manifold is also fitted to the Freelander V6, so search breakers for these too.
Some folks have opened up the KV6 manifold and removed the noisy internals, however this is not for the faint hearted, and there is a question on the power and efficiency once removed.
https://the75andztclub.co.uk/forum/s...Inlet+manifold
https://www.island-4x4.co.uk/inlet-m...1l-p-6835.html
https://www.devon4x4.com/lkb108021l-...ld-189455.html