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I appologize if this topic has already been answered. I searched the forum and didn't find the answer.
I own a 2008 C6 LS3 and would like to upgrade to an air intake WITHOUT the "Helmholtz Chamber" to muffle the sound. I read that a Z06 intake will work. Is there a certain model # or set of years of the proper intake? I found a few "25380606" intakes for a 2006-2009 Z06 LS7 for sale online, but want to make sure this fits before buying.
your post made me look up the part number, and apparently in my 2011 GS, someone swapped over an airbox without the resonator? all the diagrams show that my car should have the resonator? .... that is odd since the car is bone stock... hmm odd...
Anyway, the part number you want is 15839508 (LS7 air filter housing from 2006 to 2013). OVER $400 BUCKS NEW... LOL !!!
before buying an OEM one, i've seen some people offer them for free or nearly free here on the forum. try making a "WTB" post?
I don't get why you want to remove the helmholtz resonator, but to each their own. My car doesn't have it and i can't hear any intake noise, good or bad.
EDIT: dont know what 25380606 is, it doesn't show up as a GM part number. 25801658 is the LS3 intake with the resonator.
your post made me look up the part number, and apparently in my 2011 GS, someone swapped over an airbox without the resonator? all the diagrams show that my car should have the resonator? .... that is odd since the car is bone stock... hmm odd...
Anyway, the part number you want is 15839508 (LS7 air filter housing from 2006 to 2013). OVER $400 BUCKS NEW... LOL !!!
before buying an OEM one, i've seen some people offer them for free or nearly free here on the forum. try making a "WTB" post?
I don't get why you want to remove the helmholtz resonator, but to each their own. My car doesn't have it and i can't hear any intake noise, good or bad.
EDIT: dont know what 25380606 is, it doesn't show up as a GM part number. 25801658 is the LS3 intake with the resonator.
Thank you very much for checking. I'll stop by the dealer tomorrow and see if they can tell me any more about the differences between the two part numbers. I have found several 25380606 for sale for very cheap, but you're right -- the 15839508 is pretty expensive!
I put a Z06 air intake on mine a couple of months ago. simple swap and it really cleans up the engine compartment I think I paid about $75 for mine. they pop up in the classifieds occasionlly.
I've always been curious if you could just cut the Helmholtz Chamber off and then plug the opening in some manner. It seems like you should be able to make some type of epoxy patch or something similar.
I've always been curious if you could just cut the Helmholtz Chamber off and then plug the opening in some manner. It seems like you should be able to make some type of epoxy patch or something similar.
Yep. That's been done too. Pretty simple job and you can make the block-off cap with pieces that you eliminated.
The primary purpose of that resonator on an LS3 is to improve volumetric efficiency. Hemholtz resonators do alter sound, but that is secondary. It was added to the LS3 because of the peculiarities of its intake/head design and airflow is different than the LS7 which didn't benefit from it. Removing it on an LS3 reduces torque and impacts backflow over the MAF on stock engines. There is a lot of engineering behind it on LS3s.
I wanted to follow up on what I learned through this process. I have a 2008 Corvette Base 3LT with the LS3. I was looking for a cold air intake, or better yet a factory intake without the chambers/mufflers. Whether or not they change the flow of air, I was hoping to buy something that would give me more glorious engine noise!
I found an ebay part listed as "2006-2009 Z06 Intake P/N: 25380606". It turns out this # is stamped in the plastic. A google search comes up mostly empty. There was a sticker on it though listing part # 15839487. I believe there are alternate part numbers, but this is the entire intake housing assembly for a 2006-2013 with the LS7.
I bought it off ebay for only $43 shipped!!! When it arrived, I noticed it took the same A3077C filter as my LS3 intake. It also fit perfectly! DEAL! I bought a new filter, and am going to run it for a few weeks. Worst case I can go back to the "old" intake and keep using the brand new filter.
I wanted to follow up on what I learned through this process. I have a 2008 Corvette Base 3LT with the LS3. I was looking for a cold air intake, or better yet a factory intake without the chambers/mufflers. Whether or not they change the flow of air, I was hoping to buy something that would give me more glorious engine noise!
I found an ebay part listed as "2006-2009 Z06 Intake P/N: 25380606". It turns out this # is stamped in the plastic. A google search comes up mostly empty. There was a sticker on it though listing part # 15839487. I believe there are alternate part numbers, but this is the entire intake housing assembly for a 2006-2013 with the LS7.
I bought it off ebay for only $43 shipped!!! When it arrived, I noticed it took the same A3077C filter as my LS3 intake. It also fit perfectly! DEAL! I bought a new filter, and am going to run it for a few weeks. Worst case I can go back to the "old" intake and keep using the brand new filter.
Here they are side by side.
Thank you everyone for the help and advice.
Are there any more from this seller? Link to their ad?
How large is the sound difference? Are there any other modifications done to your car?
It's hard to quantify over the internet. I can tell the difference, and i'm happy with it. With light throttle there is no difference. Under moderate/heavy throttle the additional growl is noticeable but not "loud" or "extreme". For the price, I'm happy.
When i bought my 08 LS3 i noticed a screw was missing on the mass flow sensor. I tried the stock size screw listed on the parts list but it didnt fit. Just for grins i sent a picture to K&N to ask for the screw size and their comment was that my intake was designed for a 427 and that i should remove it as it has not been tested for my LS3. That is crazy, isn't it? It fits perfectly and it runs great. I pulled it off to clean the filter and it is just a plastic shroud. Nothing special inside. What could possibly be the difference?
When i bought my 08 LS3 i noticed a screw was missing on the mass flow sensor. I tried the stock size screw listed on the parts list but it didnt fit. Just for grins i sent a picture to K&N to ask for the screw size and their comment was that my intake was designed for a 427 and that i should remove it as it has not been tested for my LS3. That is crazy, isn't it? It fits perfectly and it runs great. I pulled it off to clean the filter and it is just a plastic shroud. Nothing special inside. What could possibly be the difference?
Airflow and the disruption of the same. A 427 exercises different airflow dynamics than the smaller LS3 engine does. In an LS3, a pulsating occurs at certain ranges which disrupts flow around the MAF. I tried to allude to this in my earlier post which didn't seem to get much reaction.
The tuned resonator is one of the reasons the stock air filter works the absolute best for performance on an LS3. Any aftermarket products I've seen and a couple I've actually tested, changes airflow dynamics enough to slightly reduce performance. If you get really lucky with an aftermarket supposed CAI on an LS3, you'll break even. But it doesn't matter if looks are the top priority.
Last edited by BlindSpot; Sep 19, 2019 at 12:45 PM.
Z06 intake on base C6
