This is quite interesting.
Would it not be possible to increase the airflow in a suitable amount in conjunction with the extra fuelling?
I know there are better ways of increasing engine performance but superchargers and turbos aren't cheap! 
How would you lower the air intake temperature?
(I'm not saying that afm trick is necessary, or even advisable, I'm just interested really 
)
No its all good if you have questions thats what most of us are here for to share the same knowledge, but don't take my word for things I suggest doing a bit of light reading or web browsing if you are interested?
The ECU has been tested time after time by VAG to take average temperatures and match fuelling needs against all sensors, now intercoolers are great if the amount of air flow is large like turbos and chargers. As for normally aspirated engines like yours it will have little or no affect as the block is not designed to take more oxygen levels, plus ambient air is its main source. The only thing you can do is lower the temps or increase air flow on hot days where oxygen is less dense in hot climates and as colder climates create more denser oxygen in a smaller cubic space.
Real benefits would be drill a few holes in the air filter box lower half only (wing side) so your filter can benefit from more air flow when the engine is at full chatt. Re direct the air source route from the wheel arches or under skirt so you have a direct cold air feed forced into the air box. Never lose your paper filter it helps too keep sh!t out of the induction, but this does mean you will end up changing the filter out after six months or less due to particle dirt flowing in. Advance the timing slightly to take advantage of the extra airflow, but real terms a few more BHP nothing substantial.
I dislike cone filters because they soak heated air from the surrounding engine bays!
Heat shields made from chicken wire and foil around the downpipes can help stop heat from rising into the bay or heat wraps on the downpipes are good short term solutions.
Higher octane fuel and advance the timing a tad to get the benefits.
Just a few things to start unless you have cash to burn then it gets interesting!
What you have to ask is why do most sport cars and super cars need to be servicing more frequent than normal cars?
Unless you have dramatically changed the Engine like flowed head work you cannot really obtain huge gains unless your car is not running right in the first place. A good base to work with is a good start.
Jay
Thanks for that mate, really is quite useful!
I bought a spare airbox the other week.
It already had the trumpet removed and I drilled the wing side yesterday and its all ready to fit on the car.
It came with a spare afm and that's why I was interested in that trick from Club GTi
So at least I have spares of both if it goes wrong
It already has Green Filter in there.
I have a RR day coming up a week on saturday so would be interested in trying to get a few more bhp out of the car for then.
Heat wrap seems expensive, is the Chicken wire and foil idea safe?
How likely is it to set on fire?
You advance the timing by twisting the dizzy cap don't you?
Might be worth looking into that too
Cheers
