drilled airbox

[Brenner5]

does anyone have pics of an drilled airbox??

where should i drill the airbox to get extra air in??

[tomstickland]

Underneath below the air filter. I prefered the "cut one massive hole" method when I did my old Vauxhall. I'm leaving the iS alone, I don't think it makes much difference to the engine output, but it does sound nice.

[ste00]

anywere below the filter, used a 3mm (i think) drill to do mine... looks like swiss cheese and not so good... but it works thats all that matters,

thing is u might get more air in but u got to wonder how much air u also lose through the holes (i know airbox pressure is low) because u cant build up anywere near the pressure u could if it was just 1 small intake and matched outlet plus if u drill oposite the intake i would guess the air would flow almost strait back out the other side,

also the air u will be adding is warm so less dense so not as good as cutting a hole and adding a 2nd intake onto the box feeding from outside the eng bay,

[M5pilot]

I cant remember whos car it was but they lost torque on a dyno when they drilled their airbox.