This top mount air box is it that huge round ugly thing? if so i have a 1.4 and have the same i tool the heat pipe out and all the other cold feed pipes.i then put the hot feed pipe in to the air box and used a tin foil type cold feed from halfrauds to extend it to the bottom of my bumper grill.
my air box has also been drilled.
ok it hasn't made a massive difference but there is a slight difference. "SLIGHT"