Thanks Glenn!
I have a performance panel filter. Interesting you say about the airbox as put my ear to it earlier whilst girlfriend revved the car and it is defiantly coming from there.....Yet I could have bet money it was coming from somewhere else in the engine!
What do you think to your 2.5 V6 mate? I love mine, costs a lot in petrol though. Was thinking about getting something cheaper to run since being signed off work due to my legs, but I dont think I would enjoy a smaller engine with an auto box which I need at the moment. Also mine is the Ghia X and has every creature comfort and parts are so easy to come by second hand for cheap for the MK3, so going to keep her!