As far as adding a larger upper snorkel and the lower F6 'Phoon snorkel, it was pretty easy and shouldn't cause you too much grief. I'm no handy man..only an avearge bloke with common sense (and one who never rushes into anything until I've had a good think about it - procrastination is my best ally!) The larger upper intake I got straight of Ebay and went in with no dramas. The lower snorkel I bought from a Ford dealer for around $80.00 (bit expensive for a piece of hard rubber) Using the instructions and dimensions that can be found on another part of this site for cutting a hole in the lower part of the airbox for the lower snorkel, it was reasonbly simple. With the right tools and patience, it was pretty easy as long as you don't go at it like a bull at a gate. The dimensions (and accompanying pictures) as mentioned earlier, if followed accurately, were absolutely spot on. I also added the K&N filter. As this is the only mod I intended to do and haven't done anything else, I have found that my fuel economy has improved and the throttle response is improved. I haven't accurately quantified each improvement but it definitely isn't the classic placebo effect IMHO. For me it was worth the effort.