2015 + Weld-in Exhaust Options

[Smoke]

I had my Magnaflow installed that I got from Mr. Tony... It sounds pretty pretty good!! very happy with the sound. A much throatier sound and NO DRONE!!! left flap valve and resonator. The flap valve is questionable... the muffler place said it looks like a 3" diameter vs the 3.5" only that small section. I almost had him remove it but didn't want to chance drone if I removed it. by the way it was a buck and a quater to get it welded in place.

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$125 to weld in a muffler....wth

 

[jl449]

Little too much? It's all good.. Santa Clara muffler - probably paying Silicon Valley wages! LOL..

They removed the flapper valve for 60 and installed a 3.5 straight pipe (my fault - when they install the muffler he asked if I wanted to remove the flapper -- I said leave it on.. mistake). I have to say it's louder through out the rpm range. Before you can only hear the deep tone during acceleration and drops off at higher RPMs. Not now! It's louder!

 

[Tahoe15cc]

Out with the old and in with the new. It sounds very nice!

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thinking about doing this same swap. did you have any V4 issues?

 

[tbordenet]

I have Range AFM part that plugs into the OBD2 port under the dash that keeps it in V8 mode. Sometimes it stops working and it goes into V4 mode, it sounds a little off but doesn't cause any problems. Its my wife's rig she doesn't want me to weld the resonator back on after the rear axle. I cut that off and welded on a black 18" exhaust tip that you can barley see. If you get on it its loud but normal driving its fine.

 

[NORCAL SS]

bolt on muffler for 5.3s ive been using/selling this one on here and locally I
http://www.tbssowners.com/store/index.php?act=viewProd&productId=313

if thats not loud enough remove the flapper



for 6.2 rigs
http://www.tbssowners.com/store/index.php?act=viewProd&productId=297

same thing if to quiet remove flapper

 

[CMoore711]

Anybody have any sound clips of the Magnaflow Muffler #12909 (Tony's link above for the 6.2)?

With or without flapper... Cold start, going down the road, inside the cabin. Anything?

 

[tbordenet]

Mine is to loud for most, but my wife likes it and it's her daily not mine. I have the Megnaflow muffler for the 6.2, flapper removed and resonator removed. It sounds more like a Camaro when you punch it.

I don't have any sound clips, sorry. I recommend doing the Megnaflow muffler from Tony and flapper delete!

 

[Shadow17]

I'm trying to get an answer to a question before getting this done next week. Is the resonator separate from the butterfly flapper? I have read to remove the flapper but not the resonator for droning issues. ???

EDIT: just answered in other post. They are in fact separate.

 

[L's Truck]

Put a Borla Xr1 in with flapper delete last week and while it sounded amazing the drone was crazy even with the resonator in tact. Went today to get the Mag 12909 installed and thats the ticket. Same throaty sound but still refined enough for the Denali. I might have the resonator deleted soon but I need to see what that sounds like first.

 

[Shadow17]

Put a Borla Xr1 in with flapper delete last week and while it sounded amazing the drone was crazy even with the resonator in tact. Went today to get the Mag 12909 installed and thats the ticket. Same throaty sound but still refined enough for the Denali. I might have the resonator deleted soon but I need to see what that sounds like first.

I don't want to single out all Borla owners. But I remember the guys in the G8 forum did not like the Borla installs on their cars. Terrible droning was always the comment. Magnaflow was a good alternative. Corsa was the best, but most costly.
FWIW, the G8 GXP and Denali engines share a lot of similarities.

 

[L's Truck]

I don't want to single out all Borla owners. But I remember the guys in the G8 forum did not like the Borla installs on their cars. Terrible droning was always the comment. Magnaflow was a good alternative. Corsa was the best, but most costly.
FWIW, the G8 GXP and Denali engines share a lot of similarities.

Interesting info on the G8. I feel the body of the Borla muffler was just too small compared to the Magnaflow to suppress a lot of the resonance. I'd love a Corsa muffler but I don't plan on racing anything so I can't justify the cost. I had just a resonator delete on my 09 Denali and that sounded good enough for me. The 12909 swap is pretty close to that.

Did you get tuned yet?

 

[Shadow17]

Interesting info on the G8. I feel the body of the Borla muffler was just too small compared to the Magnaflow to suppress a lot of the resonance. I'd love a Corsa muffler but I don't plan on racing anything so I can't justify the cost. I had just a resonator delete on my 09 Denali and that sounded good enough for me. The 12909 swap is pretty close to that.

Did you get tuned yet?

Yes. Worthwhile investment! I placed my review in the Black Bear vendor section of this forum.
The engine definitely pulls harder and acceleration is instant. The transmission tune is even better.
No more searching for shifts. Highly recommend!

 

[L's Truck]

Yes. Worthwhile investment! I placed my review in the Black Bear vendor section of this forum.
The engine definitely pulls harder and acceleration is instant. The transmission tune is even better.
No more searching for shifts. Highly recommend!

Thanks! I'll go check it out

 

[JTRATX]

Yes. Worthwhile investment! I placed my review in the Black Bear vendor section of this forum.
The engine definitely pulls harder and acceleration is instant. The transmission tune is even better.
No more searching for shifts. Highly recommend!

Good to hear you like the tune.

 

[BigVette427]

The resonator is at the end of the exhaust system before the exhaust tip, but where is the flapper valve? I have the 6.2L and so am interested in the MF 12909, but I really don't want anything obtrusive and am hoping to just swap the mufflers and keep everything else intact.

My first ride in high school was a '71 Chevelle 350 with two glass packs, and I remember what that was like. For the Denali, I want a little more exhaust note, but no drone and when cruising and moving back and forth between V8 and V4 mode, nothing annoying. Do you think this MF 12909 will fit that bill?

 

[NORCAL SS]

Flapper valve is after muffler. Ive sold many of the mufflkers and installed best bang for buck.

You will be fine on noise

 

[RThomasII]

Can anyone comment on any possible functional advantages, performance or otherwise, in doing the weld in muffler over the full cat-back exhaust or vis-versa? Obviously there is a huge cost benefit but I'm wondering if there is any reason to consider the cat-back if others are reporting sound and performance gains with the muffler swap on its own. Mainly interested on feedback as it relates to the 5.3l but I would assume the any pros and cons would apply to both the 5.3l and 6.2l.

 

[BigVette427]

Can anyone comment on any possible functional advantages, performance or otherwise, in doing the weld in muffler over the full cat-back exhaust or vis-versa? Obviously there is a huge cost benefit but I'm wondering if there is any reason to consider the cat-back if others are reporting sound and performance gains with the muffler swap on its own. Mainly interested on feedback as it relates to the 5.3l but I would assume the any pros and cons would apply to both the 5.3l and 6.2l.

Unless you are looking for certain exhaust tips, I'm not sure there is much value to be had with a cat back on these Tahoe/Yukon exhaust systems. With the 6.2's they come with 3.5" pipe and I certainly would not want to put a cat back exhaust on that went down to 3" pipes.

From a functional standpoint, swapping the OE suitcase muffler for a free-flowing muffler with less restriction is going to give you the bulk of any gains. I've done cat back's before and in most part you're paying for a name and the engineering behind it, which depending upon the application, could be worth the money. In this case of my '17 Yukon 6.2, given what I want (no drone and mild sound) and what is there, I don't see any need for a cat back.

 

[AZCreeker]

agreed with BigVette427.
Having a suburban with the 5.3, I for one think the 6.2 actually sounds much more decent as far as tone.
A family member has a 15 Escalade that I'm really familiar and you can actually hear a nice tone upon start up. Mine is as quiet as an old super muffled town car.

 

[hundhaus]

2015 Denali Callaway SC560. I hate the magna flow muffler that Callaway put on this thing when compared to my Denali XL with a Corsa. My question is this, can I run the Corsa being that it is a 3" or am I looking for trouble? The Corsa on my 2015 Denali XL was a 3" all the way to the back. I called Corsa and they told me they only make a 3.5 inch for the pick ups. Any advice? Love the Corsa sound.

I should note my concern is air flow with the supercharger running through 3" rather than the 3.5