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Airbox Hole Mod for Performance Gain?

Spec_tech

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Hi Everyone. I wanted to check with regulars to get some takes on this.

I came across a mod for the Lexus IS 350 that some people have posted on forums and youtube vids involving cutting a hole in the airbox to increase the amount of air coming into the intake.
From what it looked like, it gave a noticeable performance/acceleration increase in the videos that I saw.

Obviously a high flow air filter or new air intake would be better in general, but i'm looking to minimize costs and see which cheap mods work the best.
I understand that air intakes are designed specific ways to maximize airflow, and that putting a hole in the airbox will suck in air from the engine bay which could be warmer than the air coming in the beginning of the intake.
I'm just looking for any input on anybody who has tried it or heard about it and what they found with it.
 
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Footsole37

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Hi Everyone. I wanted to check with regulars to get some takes on this.

I came across a mod for the Lexus IS 350 that some people have posted on forums and youtube vids involving cutting a hole in the airbox to increase the amount of air coming into the intake.
From what it looked like, it gave a noticeable performance/acceleration increase in the videos that I saw.

Obviously a high flow air filter or new air intake would be better in general, but i'm looking to minimize costs and see which cheap mods work the best.
I understand that air intakes are designed specific ways to maximize airflow, and that putting a hole in the airbox will suck in air from the engine bay which could be warmer than the air coming in the beginning of the intake.
I'm just looking for any input on anybody who has tried it or heard about it and what they found with it.
As presumed, just cutting a hole you will suck up warm air. To find the cheapest resolution..., keep in mind that the actual filter should be maintained new or fresh preferably KnN and for the box create a insert cut out path vented scooping to fender to increase air. I guess a hardware store that sells hosing and plastic fittings.
 

Lancelot

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I wouldn't bother poking holes in the factory intake. I would instead get high flow drop in filters.

Poking holes in the airbox would likely introduce more dirt. With aftermarket drop ins you want to keep the air coming in as clean as possible.

The factory setup was designed to manage intake noise and draw air from lower in the car. Heat rises to the top so cooler air comes in from lower in the engine bay. With holes in the airbox, as the engine bay gets warmer, warmer air would likely come into the intake. Warmer air is thinner and you want denser cooler air for more oxygen. Hotter air thins the oxygen mix into the air/fuel mixture as it travels to the throttle.
 
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