The stock air intake tube, leading to the stock air cleaner box is slightly restrictive. Is it 3hp restrictive? No.

Simply removing the intake tube will draw in hot engine bay air, and could actually reduce your power.

In everyone's rush to find free horsepower, they add cone filters, which have lower air flow rates than the stock air filter element (research bears this out), and places the turbo air intake directly behind hot radiator air flow.

Your best move, to make sure you are getting all the benefit from the stock system, is to connect an air intake tube to a fresh air source, outside the engine compartment. Depending on your car's year, engine, and equipment, you may find an existing hole already through the forward corner sheet metal, behind the headlight.

Auto parts stores sell a flexible 3" tube which can be used for just that application. The better ones will hold their shape when you form them.

DogWhistle said:

The stock air intake tube, leading to the stock air cleaner box is slightly restrictive. Is it 3hp restrictive? No.

Simply removing the intake tube will draw in hot engine bay air, and could actually reduce your power.

In everyone's rush to find free horsepower, they add cone filters, which have lower air flow rates than the stock air filter element (research bears this out), and places the turbo air intake directly behind hot radiator air flow.

Your best move, to make sure you are getting all the benefit from the stock system, is to connect an air intake tube to a fresh air source, outside the engine compartment. Depending on your car's year, engine, and equipment, you may find an existing hole already through the forward corner sheet metal, behind the headlight.

Auto parts stores sell a flexible 3" tube which can be used for just that application. The better ones will hold their shape when you form them.

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It runs out to the wheel well to a fresh source so ill leave it alone. Also i was gonna get an injen intake but would that be ok to use if i get a filter that has a high airflow rate? But how would I solve the hot air off the radiator? Cover the new filter with a box blocking that side??

EBay intakes are fine, or pick up one used. I got my injen for $25 locally. The key is to use a 4" filter and adaptor (someone's selling the adaptor in classifieds right now) instead of the standard 3.5" filter. I had the typical 3.5" for years, then basically got a 4" adaptor for free and found the vibrant 4" filter for $16 on ebay; I couldn't believe the difference. It was very noticeable.

PlanZero said:

EBay intakes are fine, or pick up one used. I got my injen for $25 locally. The key is to use a 4" filter and adaptor (someone's selling the adaptor in classifieds right now) instead of the standard 3.5" filter. I had the typical 3.5" for years, then basically got a 4" adaptor for free and found the vibrant 4" filter for $16 on ebay; I couldn't believe the difference. It was very noticeable.

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So you recommend the 4" adapter and filters?

Demon - the site is not letting me quote right now, so here's the answer to your question:

Yes. That's why you see some guys on here building the air intake box. It is precisely to separate the cool, outside air from the hot, engine compartment air.

Unless you have a large turbo, you won't feel much of a difference with a cone filter. However, you may hear a difference.

As you build your car, keep asking questions, especially "Why?". You'll have a better car.

I have seen people cut out/open up the lower portion of the stock intake box to intake more air. If you are looking for low-cost mods on a stock car, you can also remove the restrictor in the boost control solenoid to get an extra 1-2 psi.

DogWhistle said:

Demon - the site is not letting me quote right now, so here's the answer to your question:

Yes. That's why you see some guys on here building the air intake box. It is precisely to separate the cool, outside air from the hot, engine compartment air.

Unless you have a large turbo, you won't feel much of a difference with a cone filter. However, you may hear a difference.

As you build your car, keep asking questions, especially "Why?". You'll have a better car.

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I will keep that in mind with asking "Why?". I've realized that if you ask why about things you do end up with a better car because it can make more sense and you could avoid causing damage or more issues if you know why something does what or why. And I was going to get an Injen intake once I finish up on maintenance but now that you have me thinking about that heat I wanna make a way to keep the hot air away as much as possible with the cone on the Injen. Trying to make my 16g stay as healthy as possible

2gmitsueclipse said:

I have seen people cut out/open up the lower portion of the stock intake box to intake more air. If you are looking for low-cost mods on a stock car, you can also remove the restrictor in the boost control solenoid to get an extra 1-2 psi.

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I was looking into doing that the mod where you remove that restrictor but when I was looking up more information about it I read that it can cause your engine light to trip. I'm not certain if in doing it would be healthy for the car with the stock bov.

dem0n said:

I was looking into doing that the mod where you remove that restrictor but when I was looking up more information about it I read that it can cause your engine light to trip. I'm not certain if in doing it would be healthy for the car with the stock bov.

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The stock one leaks at stock boost levels. Evo MR ( the metal one) bypass valve is a direct replacement for the plastic OE bypass valve on the 2g. I have not had a cel for the BCS mod.

2gmitsueclipse said:

The stock one leaks at stock boost levels. Evo MR ( the metal one) bypass valve is a direct replacement for the plastic OE bypass valve on the 2g. I have not had a cel for the BCS mod.

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Would you suggest me getting an Evo MR bov then? And is there anything bad from doing the BCS mod then?

2gmitsueclipse said:

The stock one leaks at stock boost levels. Evo MR ( the metal one) bypass valve is a direct replacement for the plastic OE bypass valve on the 2g. I have not had a cel for the BCS mod.

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Would this work? --> Evo BOV

dem0n said:

Would you suggest me getting an Evo MR bov then? And is there anything bad from doing the BCS mod then?


Would this work? --> Evo BOV

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You have the correct bypass valve, but you can get them used for around $60.

2gmitsueclipse said:

You have the correct bypass valve, but you can get them used for around $60.

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Buying them used a better idea because they save you money and work good?

This is the old setup I had on my car. I built an aluminum box around my filter and cut out the sheet metal below the filter and then ran ducting from the passenger side opening up to the bottom of the air filter. Of course to do this you need to have already removed the stock intercooler. This setup worked amazing and I really need to fabricate another one that fits with my new intake pipe for my speed density setup.

SOADweskey said:

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This is the old setup I had on my car. I built an aluminum box around my filter and cut out the sheet metal below the filter and then ran ducting from the passenger side opening up to the bottom of the air filter. Of course to do this you need to have already removed the stock intercooler. This setup worked amazing and I really need to fabricate another one that fits with my new intake pipe for my speed density setup.

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Nice. I'm doing this around my filter too....but the inlet is going to be in the hood.

Also, nice Snapse BOV! HAhahaha. I have the same one and loooooove it. Never gonna leak ever.

dem0n said:

Buying them used a better idea because they save you money and work good?

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Should hold up to 25-26psi un-modified.

2gmitsueclipse said:

Should hold up to 25-26psi un-modified.

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Which I believe on the stock tune with the 16g turbo the guy i bought it from just installed should be running around 12-13ish im assuming so that would work. Is it recirculated and would work with an Injen intake im wanting to get after my cars out of the shop?

It is the exact mounting as the stock 2g plastic bypass valve. Do not forget to look into a method of logging/tuning, a proper boost gauge, and wideband when upgrading.

Here is one of my 2g's with the Evo bypass valve recirculating into an Injen:

EBay hard Intake pipe. Get the three inch maf adapter and a three inch K and n filter. You may have to make a new recirculating pipe from bov to intake. Sum of us have used and old vacuum hose, and run that from the bov back to intake.
I hope this helps Ya, good luck