Air filter box mod

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by RAV52202, Jul 28, 2013.

  1. RAV52202

    RAV52202 Member 100 Posts

    I have a 2002 GMC 2500, and was wondering if anyone has modified their air filter box. I was looking at mine the other day and was thinking about cutting out a section of the bottom and taking out the base plate that it bolts to. was just thinking this would allow more air into the box. it would be similar to a K & N cold air intake. The bottom is wide open. just wondering if anyone has done this or what people think of this idea.

    Thanks
     
  2. Shouldn't be a problem as long as all cutting is done between ambient air and the MAF...
     
  3. McClintoc

    McClintoc ɹoʇɐɹǝpoɯ Staff Member 2 Years 1000 Posts Platinum Contributor

    I did this to my 2001 Silverado 1500. I basically made my own CAI. I replaced the regular air filter with a reuseable, performance filter from Specter. To let in more air, I removed the bottom and two sides of the air box. Just make sure you leave the top rim of the air box in tact so the air filter has something to seal against.
     
  4. j cat

    j cat Rockstar 4 Years 1000 Posts

    what I did was drill 3/8 inch holes in the bottom in each square. I did this to drain out the water. I found that if you drive in a very heavy dry snow it gets in there , the holes helped keep it dry.

    now if you make the bottom of the box with bigger holes or remove it rodents could get in there and chew up the filter. you would need to put some rat wire to cover this hole to keep them out.

    I also have rat wire over the intake bore.
     
  5. Cowpie

    Cowpie Member 1 Year 100 Posts

    Only problem with this idea is that you would be sucking in hot engine compartment air. hotter air is less efficient that cooler air. Kinda defeating the purpose. Now, if you were to mod the box to allow more air, and made sure that all the air getting to it was outside the engine compartment, you would have something there. configuring some form of ram intake to the box would be the cat's meow.
     
  6. McClintoc

    McClintoc ɹoʇɐɹǝpoɯ Staff Member 2 Years 1000 Posts Platinum Contributor

    No CAI is truely air tight. Some of the hot engine air will still get in. The trick is to find the happy medium between least amount of air restriction (opening the air box) and reduction of hot air getting in.
     
  7. RAV52202

    RAV52202 Member 100 Posts

    Thanks for all the great replies. Thank you. I think im going to look at my air box some more and go ahead and mod it. I think it should work good. I did think about the hot engine air but all I know that the cold air intake i had on one of my other trucks took the air box plate out and was open just the way I was thinking about doing it. Thanks again. I will let you know how it turned out.
     
  8. Kapelusprime

    Kapelusprime Member

    You do realize it dose absolutely nothing to increase HP. You will have little more noise from the motor but you get zero HP. Not my opinion, there are in the neighborhood of ten Dyno videos on youtube alone to prove it. Even the mighty K&N dose not a dam thing but make your wallet $200 lighter. Even duels without a tune do squat but deliver more engine noise. Then computer doesn't lie and K&N threatened to sue the two guys from Australia when they Dyno a car and actually showed a one horse power loss! The ECM dictates performance, just because these companies tell you your motor will now "Breath better" doesn't make the computer alter parameters it was programmed with. The most an open element filter will do without a tune to support it is, more easily introduce dirt and water or moisture into your intake. Most folks say they "feel the difference" actually only hear the difference and get no gain what so ever. To top of my post, why do you thing even the hand held tuners want you to plug in and record your vehicle with the mods on it? In order to tune so they can be utilized. Because your factory tune won't learn to optimize any mod until its programmed to do so. It's how modern ECM's work, disconnecting the battery won't do it either. The computer will always attempt to stay within a useable base line fuel and air ratio and spark curve no matter what the atmosphere.
     
  9. buckmeister2

    buckmeister2 Member 2 Years 100 Posts

    Kapel is 100% dead on. Your engine compartment is not full of hot air! As soon as you start to move, you bring outside air into the compartment, generally resulting in a diff between ambient and under-hood temps of around 15 degrees. Numerous testers have proven this by placing electronic temp gauges next to/inside of the intake, and reading temps instantaneously in the cab while driving. Most programmers have this function, and will show the same results. I LOVE the sound of the K&N/etc. intake, but you will to be running at nearly 6,000 rpm before you will see more than one or two HP improvement. Those polished intake tubes sure do look a lot nicer than our crappy air boxes, which might make it a worthwhile upgrade for that reason.
     
  10. RAV52202

    RAV52202 Member 100 Posts

    You are right they do look nicer then our stock set up. I think they make the trucks sound better as well.
     

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