Intercooler Sizes?

[Midnightclub]

If you want to use OEM stuff... 406 110 HDi top pipe, 2.2 HDi C5 lower turbo pipe/406 110 HDi turbo pipe (although it's got a super tight kink) keep the stock airbox and then loop under the airbox to the pipes by the rad, would work for single and twin pass coolers. It's basically what we did with ours looks 100% OEM opening the bonnet if you didn't know what to look for.

Essentially the bits you've linked, except the C5 pipe you posted is correct. You want the one on  the right in this picture (that's the 406 one, C5 one is better)