6.2 Exhaust Help

[Agent WD-40]

I just got a 2012 Denali and I'm loving it so far. The newer 6.2 motors with AFM have MUCH quieter exhaust than the earlier ones and I'm looking to change this.

I've been reading through all of the exhaust threads. Seems Magnaflow weld in and Corsa are the most popular options. I've had Magnaflow and Corsa on my last 2 vehicles. I was happy with both but I'm looking to try Borla - or something a bit different.

The Goal: I'm basically looking for a low deep rumble that isn't too loud, doesn't drone, and doesn't have terrible AFM noise. This is my daily commuter and family vehicle so I want to keep it reasonable.

I have 3 ideas and am looking for some feedback:

Option 1: I'm looking at a Borla weld in for now. The stock 3.5" pipe limits the choices pretty quickly though. The only ones they have are XR1 mufflers (sportsman and multicore). Any experience with getting a Borla weld in on the 6.2 and not having annoying AFM noise and/or drone?

Option 2: Cut out the rear muffler/resonator and remove the 3rd cat. I know the factory muffler will prevent any drone and AFM noises but I'm not sure if this will be loud enough.

Option 2A: If Option 2 isn't loud enough the next step would be to add high flow cats and or Long Tube headers. Anybody tried this with the stock muffler on a 6.2 with AFM?

 

[NathanJax]

Step 1: remove your rear resonator. See how that sounds. Most people do this and it's perfect.

If you want more, that's when I'd see about doing option 1 or 2.


You can remove your resonator in your driveway with a hacksaw if you don't want to pay someone $20 to do it professionally. You don't even need to add tips till you know that's what you want.

 

[08grey]

Magna flow 12909.

 

[Agent WD-40]

Step 1: remove your rear resonator. See how that sounds. Most people do this and it's perfect.

If you want more, that's when I'd see about doing option 1 or 2.


You can remove your resonator in your driveway with a hacksaw if you don't want to pay someone $20 to do it professionally. You don't even need to add tips till you know that's what you want.

Thanks. This is how I'm thinking I'll start.

---------- Post added at 01:50 PM ---------- Previous post was at 01:50 PM ----------

Magna flow 12909.

Can you tell me how that muffler sounds with AFM active? I really want a system that you don't hear AFM activate.

 

[TowGMC]

On my '09 when I removed the rear resonator the drone inside was horrible, especially when towing my trailer where pulling at 70 in 5th gear put the engine in a rev range that was the worst for the drone. Put the resonator back on and left it there. Interestingly a friend with an '09 Denali XL did the same thing and there's absolutely no drone, but the longer length of the XL probably means the sound waves in the pipe are hitting in different places.

Can't speak to the XR1 on a Denali but a pair of them on my 911 race car are still pretty loud

 

[HBrown2008]

How to shut up a 2008 Yukon Denali

Hello,

I'm new to Yukon. Have a 2008 Denali that I'm trying to shut up. Sounds like an old loud truck about to stall out. You can hear it idling a half a block away. I like the truck so I will put up with the 8.5 MPG but I don't want to put up with the noise. I'd like it to be as silent as possible.

Does the noise mean that the resonator has been removed? If so, how can I check? Do I need to get a better muffler? If so, any suggestions?

Thanks.

 

[08grey]

Thanks. This is how I'm thinking I'll start.

---------- Post added at 01:50 PM ---------- Previous post was at 01:50 PM ----------





Can you tell me how that muffler sounds with AFM active? I really want a system that you don't hear AFM activate.

It's a great setup. There are videos on YouTube of the tone. No drone. But I don't have Afm on my Denali. With all the oil burning stuff I have read I don't want it either.

 

[Agent WD-40]

Hello,

I'm new to Yukon. Have a 2008 Denali that I'm trying to shut up. Sounds like an old loud truck about to stall out. You can hear it idling a half a block away. I like the truck so I will put up with the 8.5 MPG but I don't want to put up with the noise. I'd like it to be as silent as possible.

Does the noise mean that the resonator has been removed? If so, how can I check? Do I need to get a better muffler? If so, any suggestions?

Thanks.

If you have a resonator you should see an extra little "muffler" right out back by the exit to the exhaust. It looks like a large cylindrical can with the exhaust pipe coming in one end and out the other.

If you want quieter exhaust you ought to look for a factory setup from one of the newer Denali's or Escalade's with AFM (2010+). Mine is VERY quiet. You hear a slight V8 rumble but it is pretty quiet.

I've heard the Denali/Escalade exhaust from the 07-09 model years and it is much louder (my friend had a 2007 Escalade). It honestly sounds closer to the sound I'm looking for.

 

[Blazed]

In my experience I'd remove the third cat before you made any other moves.

 

[Agent WD-40]

In my experience I'd remove the third cat before you made any other moves.

Thanks for the advice. Did you do this on yours? If so, how did it turn out?

 

[mlgreen]

XR1's are race mufflers. I've heard them on a dodge charger and a mustang. They are loud and drone like crazy.

Sent from my SPH-L710 using Tapatalk

 

[Agent WD-40]

Thanks everybody for the help. After reading all this I think I'm going to just get a Corsa.

Now I need to decide on rear exit, side exit, or dual rear exit with an Escalade Platnium bumper.

 

[Dustin.]

i have xr1s on my tbss and they drone pretty bad

 

[HBrown2008]

If you have a resonator you should see an extra little "muffler" right out back by the exit to the exhaust. It looks like a large cylindrical can with the exhaust pipe coming in one end and out the other.

If you want quieter exhaust you ought to look for a factory setup from one of the newer Denali's or Escalade's with AFM (2010+). Mine is VERY quiet. You hear a slight V8 rumble but it is pretty quiet.

I've heard the Denali/Escalade exhaust from the 07-09 model years and it is much louder (my friend had a 2007 Escalade). It honestly sounds closer to the sound I'm looking for.

Thanks for that info. I do have a little muffler as far as the back of the truck but I thought that was the regular muffler. I'm going to see if I can get under it to see exactly what I have. I really want NO sounds -- like a well tuned car- so I don't even know that it is on while standing right next to it. So, I'm willing to try a few things.

 

[thirdcoast]

Magnaflow

Magna flow 12909.

I called Magnaflow and this is the exact part number they recommended. The size is 5" X 11" X 22".

What else did you do other than install the muffler? Did you leave the resonator?

I am also going to install the SLP 3.5 Dual Tips which is not a resonator delete.

I do not have AFM on my Tahoe so do not have to worry about that.. just looking for a more custom sound..

Thanks,

Thirdcoast

 

[08grey]

I left the resonator in.
I didn't know there is a slp tip that's keeps the resonator what's the part number?

Just weld in the new muffler it will smell for the first couple of days then it will get a little louder. I am very happy with how it sounds and performs.

Btw the muffler shop will want to keep you old muffler as it is a very desirable part. Make sure you get it back.

I got mine from advance auto parts. They constantly have 20-30 percent off deals.

 

[thirdcoast]

SLP Part No.

I will get the part number off of the SLP tomorrow when I go to my shop..

Thanks for the info, I think this is what I am going to do also. Can't have drone in the vehicle or I will get lumps on my head.

I do not have the cylinder deactivation on mine as they used the L9H engine in the 2009 Tahoe LTZ..

Then install the AirRaid MIT & get the tune.. done & should get some HP increase..

Thirdcoast