6.0 Cold Air Is Way Too Loud At 75, How do you shut it up!

[Searay45db]

Ok, I have visited this once before, but since then I have become more educated. As most of of you know, K&N owns AEM and Air Raid. The 6.0 is a really loud engine, which is why there is so many baffles and resonators on the stock. I removed the AEM because it was really super loud because of the metal pipe. Now on the k&N with the plastic pipe, little better. I am also chipped, so I am sucking a lot of air. Air Radid or maybe Spectre, who every K&N owns makes a set-up where you keep the factory box, but then have a a free cold air intake pipe that helps with the noise a lot. Talking to a company that sells noise insulation for the engine room, they recommended putting in a new noise insulation blanket under the hood, it's pretty thick. I also have a Magna Flo coming out the back which is letting more air in.

Anyone have any luck or y'all enjoy massive intake noise at 75?

 

[Mechanic421]

I have same truck 05 denali xl. With Gibson 3 inch exhaust airaid jr( stock box but popped out plastic piece of box. At 75 can just hear exhaust. And the gibson system is not very loud.

 

[Searay45db]

I have same truck 05 denali xl. With Gibson 3 inch exhaust airaid jr( stock box but popped out plastic piece of box. At 75 can just hear exhaust. And the gibson system is not very loud.

I heard the Air raid jr. was an option. Wonder how much HP i lose...

 

[Mechanic421]

They us same air box on the duramax i doubt you will loss any power just pop out the big piece of plastic from fender side of box.

 

[Wagnasty]

I heard the Air raid jr. was an option. Wonder how much HP i lose...

Not enough to be noticed

 

[#1taho]

What kind of noise are you hearing. I can't compair Apple to apples cause I don't have a k&n or air raid, but I do have the cheep cold air kit and magnaflow exhaust. I don't hear anything. I drive it fairly hard and 80 mph plus and still don't hear anything. Step on it hard and hear very little sucking noise for a second.

 

[Sasquatch]

I don`t have a 6.0 but i have a spectre cai with an aem filter, Catback and a BB tune and just like #1taho i only hear any noise when hitting the gas hard off the line or free revving the engine for a second and unless you`re trying to hear it you almost never notice it.

 

[iamdub]

Sounds like your engine is under more load than it should be at 75MPH. Also, being "chipped" has nothing to do with how much air the engine sucks in. Unless by "chipped" you mean cammed or ported or something along those lines. You don't/can't "chip" pretty much anything newer than OBD2 as they are simply reprogrammed or "tuned" instead of having a PROM chip replaced.

How is your intake set up? Is it basically a tube coming off of the TB routed towards where the stock filter box used to be with a conical filter on the end? Or does it go into a fully-enclosed filter box (not a "heat shield")?

 

[Searay45db]

Interesting comments. K&N Cold Air, Conical goes into a K%N black plastic pipe. Straight to the TB. When I am driving 75, I have my foot on the gas, and its loud. If I go to 80, it quiets down. Talking with K&N and others, the 6.0 is a loud engine, which is why when you take the factory pipe off, there is a lot of resonators and baffle's to quiet it. I am hearing both a lot of air coming in and you are hearing noise coming form the engine. I have the same set-up on my 5.3, no big deal, but AEM and K%N have both said there is a huge difference with the 6.0.

I average around 16.5 MPG at 75. If I slow down, it goes way up. Again, there is a huge difference with the 6.0 and the 5.3.

Chris, are you 6.0 or 5.3? AT 80, I am not that bad.

I did look at the Volant Cold Air Intake. It's pretty cool. They make snorkels' and stuff. There cold air intake is a closed system, and they run a tube to pick up the air lower in the vehicle to get a higher temp, then goes into a closed box, station tube to the TB.

As far as ending load goes, I have a computer on it, not doing anything unusual.

 

[#1taho]

I am a 6.0 now. Tunned

 

[Mechanic421]

So I just got off I95 at cruise set at 75 with air aid jr. I can not even hear my intake at all. Just some exhaust. Loaded down with a lot of weight!

 

[Searay45db]

I am a 6.0 now. Tunned

Do you find it loud with the CAI? It's really bad around 70/75. Which CAI are you using?

 

[Mechanic421]

I posted earlier but 05 denali xl with air aid jr.

 

[Mechanic421]

Sometimes when cats plug they sound loud through the induction.

 

[iamdub]

It's not making any sense to me. The intake noise should be linear with throttle angle/load. Unless, somewhere around 80MPH, yours downshifts or the torque converter unlocks and allows the engine to spin a few hundred RPM faster, the engine should get louder at 80 than it is at 75. Or maybe right at 75 with TC locked in OD at that particular throttle angle, the engine produces a specific frequency that just so happens to be the resonant frequency of the cabin/your ears/etc. But then, there's always the chance that the muffler is contributing to this very specific resonant frequency. I'd put the stock filter box and filter back in and get an MIT.

 

[#1taho]

Do you find it loud with the CAI? It's really bad around 70/75. Which CAI are you using?

I have an eBay kit. I have a real hard time hearing it at any speed. Even when I mash the gas I have a hard time. When it's idoling with the hood up the air noise is faint. I gave used a few k&n and air raid and never heard anything.

 

[1992rs]

My 02 Denali does what you describe. It's like it has drone that exhaust gets, except in the intake. It happens at 60+ when I've been at the same throttle level for a while. I like the sound so it doesn't bother me. I'm stock with an Airaid jr. And a green filter.


Sent from my iPhone using Tapatalk

 

[Searay45db]

Problem Explained! Ok, while talking with Volant and a few others, and looking at my driving, the correlation was always around RPM's, not MPH. So to use one the terms described here, it was a loud Drone sound. Essentially what is happening that when you have a CAI and Tuned exhaust, at some point you can, not will but can get to a point where the same harmonics are coming from both, and it is loud. Very loud. The Air Rad JR. gets rid of this easily as it uses the factory box, so you never hear the first harmonic. Sometimes you will actually have this so bad you will have to change both the CAI and the exhaust so they don't over lap. So at like 2100 RPM's, every time, the motor would be much louder, but when I accelerated, It would quiet down till it dropped down to the same RPM.s again. The reason why I went with the Volmant is that it is a sealed system, so your chances of having that front are deeply diminished because the box insulates it. It it is still bothersome, then back to the exhaust shop for them to change the tune. It's not common, but when you get it, it sucks.

So the reason why I am not doing the Jr is simply because I like the Vomant design with the forced air induction. Thanks for everyone on the input, it helped a lot.

 

[DirtyBlackHoe]

Sounds more like exhaust drone than anything to me.

 

[Searay45db]

We will know soon enough, but the noise is not nearly as bad in the back seat as it is in the front seat.