I think I've developed something pretty good, it neither uses the filter infront of the radiator nor having it inside the engine. I'll test it abit today and see how it performs.

The idea came about from my fiance'. She has a 2007 2ltr Turbo VW Passat, I beat her car easily by 1 to 2 car lengths everytime, any who I had some spare pipes and pod filter laying around and I thought I'd install it on her car (more or less for the sound it makes) I never believed a CAI would produce much power.

Last night we found ourselves at a set of lights and she absoutly smoked me I'm talking kept pulling away the further we kept going + her car has all our new stuff for our house maybe 150 + kg's.

I adapted the idea of how I did her CAI and did it to my XF now I'll see if it has as much of an impact on my car as it did on hers.

And yes it is embaressing being beaten by the fiance'