i'l wait for Mike's input, I'm sure he'll be around soon!

All depends on the skill base required, I'm not the greatest mechanic at all, but I may "have a go" depending on what's needed... 2006 HSE for Sale - £7,499 (Manchester)
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I've got to ask, why would you increase the size of the intercooler without going for a bigger turbo as yes, it is better for cooling but you have an increase in air volume against the same size turbo, which would surely mean more air to push about and therefore not as efficient?
or am I missing something? Diesel sport BAS remapped by Bodsy
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Most of the benefits of an intercooler are down to improved thermal efficiency. It's always most effective with a forced induction system as the extra heat introduced by the turbo means a greater temperature differential with the ambient air. A lower charge temperature will reduce knock, as well as cyclic heating via the turbocharger, thus allowing the benefits of the additional air and fuel to be taken full advantage of, and reducing the chances of engine damage, particularly on a more highly tuned engine.

Quote:

yes, it is better for cooling but you have an increase in air volume against the same size turbo, which would surely mean more air to push about and therefore not as efficient?

There's no increased air volume due to the intercooler, only as much air as the engine can take will go in - the denser the air, the more oxygen there is for any displacement. The intercooler will make the air denser, potentially relieving back-pressure on the turbo. As the TDV6 utilises a variable geometry turbo, I believe a remap will also increase boost pressure, from the same turbo.

Hope this helps.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver