Punching Air Box Holes

[schreck]

I've seen threads claiming that punching a couple of holes in the bottom of the stock box will add a minor amount of hp along with a satisfying growl on acceleration.

Question 1: Does this void the factory warranty?

Question 2: Doesn't adding holes to the bottom of the box allow for engine heat to be sucked in instead of cooler air? Wouldn't it be smarter to punch the holes in the front part of the box that faces the front grille?

[PHXDEMON]

Probably won't void the warranty.

It may add some sound but just get an aftermarket intake that way if you have to take it in you can swap the stock airbox back on

[06silveryaris]

I had it on my HB it sounds very deep. As far as the warranty just buy another bottom half of a airbox at the junkyard or used parts depot and cut that one.This way just swap before going to the dealership

[xen555]

I had it on my HB it sounds very deep. As far as the warranty just buy another bottom half of a airbox at the junkyard or used parts depot and cut that one.This way just swap before going to the dealership

cuanto te cobraron?

yo estoy buscando una pero no me lo quieren vender solo
es para un inventito que quiero hacer

[whiteghetto]

I have done this
simota dry filter
swiss cheese airbox

I dont have numbers
but I would say
a little more power up top
does have a 'nicer' sound
if I am good I get better MPG (a few MPG)

[YarisSedan]

LOL i did this mod on my 240sx years ago. It seems like its a popular mod on every car forum i have ever been on.

[scape]

there's no concern for excessive moisture at the stock filter?

[06silveryaris]

cuanto te cobraron?

yo estoy buscando una pero no me lo quieren vender solo
es para un inventito que quiero hacer

nunca la cobre pq mi yaris no tiene garantia pues no tuve q ir al dealer en quebradillas hay un junker q tiene muchos yaris

[AlexNet0]

there's no concern for excessive moisture at the stock filter?

I doubt it, most of the cold air intakes go right under the headlight, and can be splashed if you go through large puddles.

[06silveryaris]

I doubt it, most of the cold air intakes go right under the headlight, and can be splashed if you go through large puddles.

I never ad any problems wit mine and it rains alot here

[Thirty-Nine]

I cut the entire bottom out of my airbox leaving the bottom of my K&N air filter exposed. You can see pics here:

http://www.subcompactculture.com/2008/03/better-breathing-for-my-yaris.html

[eric81]

I met with Astroman close to almost a year ago now, and he had a true CAI (one that goes to the bottom of the engine bay) and told me he cut the slits off of the back side of the fog light covers, to let in a little more cold air. According to his computer, it dropped the temp in his engine bay about 25*F. I bought a CAI a while ago, and just two days ago cut the slits off the back side of my fog light covers. I will most deffinately say there is some serious engine temp difference. I noticed my radiator fan took MUCH longer to kick on, and only came on after sitting for several minutes. That led me to my next experiment... cutting the bottom of the air inlet for the cabin air. Problem with that, is that there is a metal piece between the air inlet and the actual engine bay. I mostly wanted a way to cool off the upper side of the engine, since that is where heat goes (it rises). Also, being as far back a that air inlet is, it would do wonders to help cool off the header faster, without having to coat it or wrap it and degrade it's life span any. (Yes, wraps and sprays actually do shorten the life span of headers, ask anyone who has done it 2 years ago or longer). Great idea to make your own CAI. It is smart and cheap. And even looks stock from the topside. Sleeper comes to mind.