As you have the ultimate in D2's, being the D2a, it already has a larger intercooler than the earlier models.
So, before you spend your hard-earned $$$, just double check that it is infact larger than the current one.
Now, dont ask me what the actual size difference is, or the size of yours (ours... ) as I have no idea.
As for the benefit of a larger intercooler, it basically means that more air is being cooled, therefore the air is denser, therefore more bang for your engine.
If, however, you find that the one you are looking at is the same size as the current one, then it would probably be good to just give it a really good clean out. That means inside & outside...
As always, the instructions are here somewhere... Probably in The Good Oil.


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.....you should be methodical and allow plenty of room to see what you are doing properly.....I would recommend removing the front grille (Not hard on an 04), the battery and battery box (Again - not hard and while you've got the ECU out - send it away to be re-mapped) as well as the air filter box (Easy-peasy) and of course - the fan (You'll need a 'special' tool). This will give you great access to all of the hose clamps, radiator supports, the radiator itself and also - I recall your disco is an auto so you'll need to access the auto-trans cooler as it will always move when you disturb the radiator to remove and fit an intercooler.
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