I very nearly bought one of those ones in the link, they looked good. I ended up making one myself and it's working great. I pulled the intercooler and manifold off my td5 and found surprisingly there wasn't much oil and sludge in there after 250,000km. Interestingly, a mate at work just bought a new NP300 navara and put a catch can on, he's just about filled it up in less than 10,000! Tonnes of vapour in it, not so much in the td5.