Hi,

Here is a link to water wetter, it has been around for years: https://www.eurocarparts.com/p/redli...SAAEgIs-_D_BwE

The turbo after cooler on a Cos simply fits to the water outlet on the Turbo and then feeds in to either a swirl pot or to the header tank. I guess you could fit it anywhere that has flow though.

https://www.burtonpower.com/airtec-t...k-attc4bk.html

Burton sells them.