Also on the bigger engined cars there are holes cut out in the grille to allow air in unobstructed. I had already modified my grill with a drill. This cheap mod catches more air and diverts it to the intake.
Part required is an air duct part number 3B0853562 and cost me £2.66 from the main dealers. That was with out any discount but I wasn't going to complain at that

It looks like this

And just clips to the back of the existing factory grille.

It then acts to deflect high pressure air upto the air intake. This would have a minmal impact on engine cooling.

And refitted. Must be worth at least 0.5bhp at 120mph


Karl.