hi! so en buddies from me drives a 3er golf and he has drilled into his air filter box (four-angled) some holes! and nja that makes a lot of noise! but I have a round air filter! and I also cut a few holes in it! also have a k&n filter in it! but with him it makes more sperl as with me! why!???? can it be that I have drilled up the wrong air filter box!?? because a seat is still sitting in front of the engine seat at the top left under the cover! but I think that’s the air filter for the inside ventilation!??? writes with please just ma en couple suggestions! thank you MfG devil!