it never hurts to have increased air flow so a 1.9cdti air intake pipe (which is the same as the VXR intake) will help with that, any cone filter setup will just induce heat soak unless you go all out and make sure that it's properly segregated so as to avoid any heat soak from the engine. The problem with induction kits is increased noise which is great on a petrol car but you don't want to advertise the fact that you are driving an oil burner any more than you already are.
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