21+ Exhaust

[TrucksterZ71]

Anybody pulled the trigger on custom exhaust yet, or have any idea when the aftermarkets (Borla/Corsa/etc.) are going to start showing up for these? I was going to wait for the chevy performance setup but fear it may be too tame sounding.

 

[BTSRT]

Whipple wont be coming until mid 2021 (waiting on tunning). I'm waiting to hear back from Corsa and Wilwood.

 

[Bigmanny]

Ok guys. I had a nice chunk of accessory credit from GM and bit the bullet on the GM Performance Exhaust. Had it installed today and drove about 30 highway miles and a little bit around town. Notes below...

1. The new exhaust tips are bigger and Chrome with the bowtie stamped on top. There are no holes on the inside of the tips like factory.
2. The resonators behind the tips are about 1/2 the size of the OEM
3. There is not a flapper valve on the egress side the muffler (this was standard on the 6.2L)
4. still a very big suitcase muffler
5. and still a flapper valve on the ingress side of the muffler just past the flex pipe

The exhaust has nice deep sound, but nothing too crazy. You certainly hear it when getting on the throttle. Highway was good a little bit of drone (with cruise control) that I am assuming is when the DFM kicks, but it goes away. I had cruise set to 75 and I noticed it 2-3 times across the 30 miles. If I applied a bit of gas it goes away instantly. Also, had the stereo off the whole way and no kids fighting.

 

[Boone450r]

Ok guys. I had a nice chunk of accessory credit from GM and bit the bullet on the GM Performance Exhaust. Had it installed today and drove about 30 highway miles and a little bit around town. Notes below...

1. The new exhaust tips are bigger and Chrome with the bowtie stamped on top. There are no holes on the inside of the tips like factory.
2. The resonators behind the tips are about 1/2 the size of the OEM
3. There is not a flapper valve on the egress side the muffler (this was standard on the 6.2L)
4. still a very big suitcase muffler
5. and still a flapper valve on the ingress side of the muffler just past the flex pipe

The exhaust has nice deep sound, but nothing too crazy. You certainly hear it when getting on the throttle. Highway was good a little bit of drone (with cruise control) that I am assuming is when the DFM kicks, but it goes away. I had cruise set to 75 and I noticed it 2-3 times across the 30 miles. If I applied a bit of gas it goes away instantly. Also, had the stereo off the whole way and no kids fighting.

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Do you have or are you planning to get the performance intake?

I have to take the Escalade in tomorrow for the seat airbag recall (was hoping it could wait till the first oil change, but it started acting up) and am hoping to hear one. The dealership has/had an Escalade with the Performance package installed from the factory.

 

[Bigmanny]

I have put K&N on vehicles before and pretty much taken them right off. I never liked all of the swooshing intake sound. However, my buddy has the 2020 Sierra with exhaust and intake it seems ok.

 

[TrucksterZ71]

Just saw that MagnaFlow has '21 systems out now. Now I have to decide between that and the Chevy Performance ones ...

 

[Bigmanny]

Looks like GM added + updated the pictures on the accessory page for both single and dual exit. The performance intake is still not listed and I was thinking about getting it with the 25 percent off promo.

 

[TrucksterZ71]

Ended up getting the Magnaflow - overall happy, seems a little more responsive (using no actual science), and has a nice tone when stomped. Maybe wish it was a little louder, but no annoying drone which is nice since this is predominantly a family hauler. Terrible picture, but I like the black tail pipe vs the factory look. Went on easy.

 

[d0wnShifT]

I'm going for the Magnaflow quad exit for my Z71. I'll have to get the rear valance with the exhaust cutout (P/N 84751055) as well.

 

[debo4x4]

I installed a magnaflow 12909 today on my denali and it's a little louder than stock at idle and you can definitely hear it with some throttle. I removed both adaptive valves and now wishing I didn't as there's some pretty good drone at low rpm. Not sure what I'll do now. I saved the stock setup so I could try adding thr valves back or just go back to stock. I like the sounds but can't take the drone in the family cruiser.

 

[BTSRT]

Should of installed a corsa muffler. I have zero drone.

 

[Bigmanny]

I have the factory Perf exhaust and the only time I hear drone is on the highway cruise control set 65-85. The DFM/AFM kicks in and I do get some drone when the engine is being asked to work low cylinder mode. It is not terrible. It does go away as soon as the engine needs to go back to v8. The factory kit does have 1 adaptive valve in front of the Muffler.

My wife has not commented about it yet so the drone is cannot be that bad.

Anybody have word from Range on the AFM disabler? https://www.rangetechnology.com/products/afm-dfm_disabler/

 

[ktcarpenter27]

Gibson

 

[Dogged]

Should of installed a corsa muffler. I have zero drone.

What model Corsa did you install? Did you keep any of the valves and/or resonators?

 

[BTSRT]

I'll check Monday - Swapped muffler only.

 

[TrueAt1stLight]

Any updates to those whom have installed performance mufflers? @Bigmanny how are you liking your setup? I’m SO on the fence with this and if I should pull the trigger on the 6.2 OEM setup for my Denali that just arrived.

When COVID lets up and I’m back to my normal job operation, I’ll be spending 30-40k per year on the highway and I just am concerned about drone driving me insane. That’s my biggest fear of switching.

 

[Bigmanny]

The OEM perf exhaust is pretty tame, but it does wake the vehicle up and sounds great when you get on throttle. My wife has 2020 Lexus RX V6 that had a better sounding cold start than my 6.2 V8. The drone is only noticeable in those highspeed cruise situations when the thing is in 10th gear and using minimal cylinders, that being said it is not that bad. If you use the L Button to select your max gear and leave it at 8 you will never notice the drone when on the highway. Anybody know if the range select also disables the AFM/DFM?

 

[TrueAt1stLight]

The OEM perf exhaust is pretty tame, but it does wake the vehicle up and sounds great when you get on throttle. My wife has 2020 Lexus RX V6 that had a better sounding cold start than my 6.2 V8. The drone is only noticeable in those highspeed cruise situations when the thing is in 10th gear and using minimal cylinders, that being said it is not that bad. If you use the L Button to select your max gear and leave it at 8 you will never notice the drone when on the highway. Anybody know if the range select also disables the AFM/DFM?

Thank you! That's great feedback. My dealer has a Sierra with the 6.2 and the performance exhaust. May take it for a highway drive to see if I can hear any drone. My concern is that I'll spend 99% of my time driving my Yukon in 10th gear with the cruise set at 75 MPH. With that being said, I certainly don't NEED a performance exhaust, but "GTHO of here with that logic" is what I tell myself!!!

 

[Bigmanny]

I only hear the drone in a way that bothers me when it is in low cylinder mode but trying to work a little bit. For example, on a long stretch of highway that has a slight incline. car is accelerating but not enough to make it want kick back into V8. When traversing that stretch of highway (slight decline) no drone. The fix is to give it some juice which knocks it back into V8 mode.

 

[BTSRT]

Corsa Muffler that installed - cp300ct universal muffler - 3"