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Went back to stock #5209560 09/10/19 07:03 PM
Joined: Dec 2013
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barkingspider Offline OP
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I recently purchased an 04 Chevy Avalanche z71 4wd, previous owner had a K&N fipk installed. I asked if he still had the stock air box and ducts and he looked at me funny but he still had it buried in his garage. I drove the truck for 3 weeks w the fipk and it felt sluggish on the low end. Today I installed the factory air intake w a new champion air filter and now the low end feels a ton better, more power. I did clean the MAF and throttle body since I had it exposed, wasn’t too dirty. I would never recommend a K&N fipk unless you spend a lot of time in the high rev range but even then...

45658D91-65B6-4F25-A90B-720C423D2CFC.jpegB87EEC86-98FE-413E-A479-CCA2B4E2FE1B.jpeg8D071858-6127-4989-BFF1-503A1601CA17.jpeg09DA672E-9378-4704-82D4-7E1162D116BD.jpegE84F54AD-56CF-42DE-BAA1-EED624A60512.jpegE2F25662-F43A-4D30-A179-AC8AF16B20C5.jpeg

04 Avalanche Z71 4x4
Re: Went back to stock [Re: barkingspider] #5209569 09/10/19 07:09 PM
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LotI Offline
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Looks better stock too.


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Re: Went back to stock [Re: barkingspider] #5209579 09/10/19 07:19 PM
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barkingspider Offline OP
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Champion air filter on clearance from summit racing $7
[Linked Image]
[Linked Image]


04 Avalanche Z71 4x4
Re: Went back to stock [Re: barkingspider] #5209590 09/10/19 07:28 PM
Joined: Jun 2012
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oldhp Offline
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Now you are getting true "colder" air than with the open, inside the hot engine compartment. A stock engine doesn't need anything better than the stock air box / air filter from the factory.


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
Re: Went back to stock [Re: barkingspider] #5209621 09/10/19 08:00 PM
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JeffKeryk Online Content
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Bravo. I hate K&N.


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Re: Went back to stock [Re: barkingspider] #5209622 09/10/19 08:01 PM
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NO2 Offline
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K&N media doesn't filter as well as OEM.

Re: Went back to stock [Re: barkingspider] #5209627 09/10/19 08:06 PM
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Blkstanger Offline
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Good job! I am another K&N hater.


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Re: Went back to stock [Re: oldhp] #5209628 09/10/19 08:07 PM
Joined: Dec 2011
Posts: 6,969
rooflessVW Offline
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Originally Posted by oldhp
Now you are getting true "colder" air than with the open, inside the hot engine compartment. A stock engine doesn't need anything better than the stock air box / air filter from the factory.

I've said it before and I'll say it again - stock components are always a compromise and are developed to find the balance between performance and efficiency while also considering noise and ease of serviceability.

It is entirely feasible to shift the balance toward your preferences with aftermarket parts. Just based on the size of the factory resonator, the K&N should give the engine some nice intake noise, at a minimum.

Something else not many take into consideration - that mass of black plastic certainly retains a lot of heat - and is sitting in the engine bay the same as the K&N.


"Zed's dead baby, Zed's dead."
Re: Went back to stock [Re: rooflessVW] #5209643 09/10/19 08:26 PM
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geeman789 Offline
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Originally Posted by rooflessVW


... I've said it before and I'll say it again - stock components are always a compromise and are developed to find the balance between performance and efficiency while also considering noise and ease of serviceability.



You missed the key attribute - COST. When cost is not an issue, you end up with $ 400 000 Bentleys. Everything else is built to a price.


2011 SUBARU Impreza 5-door manual / 2016 HONDA Pilot / 2011 MAZDA 2 auto
Re: Went back to stock [Re: barkingspider] #5209647 09/10/19 08:30 PM
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E150GT Offline
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When I bought my Buick it had a K&N filter in the stock air box. I threw it away.


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Re: Went back to stock [Re: barkingspider] #5209678 09/10/19 09:15 PM
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Chris142 Offline
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That stock lid has the restriction gauge. No reason to open the lid until it shows a restriction.


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Re: Went back to stock [Re: barkingspider] #5209681 09/10/19 09:17 PM
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AZjeff Offline
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Good choice going back to the OEM filter living in socal. At least while you own it you won't be sucking dust and sand through the engine.


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Re: Went back to stock [Re: rooflessVW] #5209683 09/10/19 09:19 PM
Joined: Jun 2012
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oldhp Offline
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Originally Posted by rooflessVW
Originally Posted by oldhp
Now you are getting true "colder" air than with the open, inside the hot engine compartment. A stock engine doesn't need anything better than the stock air box / air filter from the factory.

I've said it before and I'll say it again - stock components are always a compromise and are developed to find the balance between performance and efficiency while also considering noise and ease of serviceability.

It is entirely feasible to shift the balance toward your preferences with aftermarket parts. Just based on the size of the factory resonator, the K&N should give the engine some nice intake noise, at a minimum.

Something else not many take into consideration - that mass of black plastic certainly retains a lot of heat - and is sitting in the engine bay the same as the K&N.


BUT!!!!!!!!!!! The stock air system is sucking in outside the engine compartment air!!!!!!!!! NOT...The inside engine compartment HOT air!!!!! NO BACKS!!!!!!!!!!!! banana


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
Re: Went back to stock [Re: Chris142] #5209686 09/10/19 09:25 PM
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Posts: 1,992
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92saturnsl2 Offline
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Originally Posted by Chris142
That stock lid has the restriction gauge. No reason to open the lid until it shows a restriction.


If you are waiting until you experience restriction to replace an air filter, you're waiting too long IMO.


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Re: Went back to stock [Re: rooflessVW] #5209695 09/10/19 09:47 PM
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GZRider Offline
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The metal absorbs more heat energy per cubic cm/inch of material and retains it longer then plastic. As with red painted brakes, wheel spacers, odd tints, LED's and plastidip... I'd like to know how many tq and hp those nice intake noises are worth exactly? Aftermarket intakes can potentially be a ticket in Cali though, which is less nice. Add to that the OP's climate with the sand, wildfires ect, and it's just not the place to run a high flow aftermarket filter.

Last edited by GZRider; 09/10/19 09:50 PM. Reason: forgots
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