2014+ Exhaust Systems & Mufflers

Anastazi Sarigiannis · October 24, 2015

I'm thinking about chopping the stock muffler out and putting in the 12229 magnaflow muffler in its place and keeping everything else in there. The flapper valve should help with the V4 buffeting/helicopter noise and the resonator will abate the resonance AKA "drone". Considering the GMPP Borla system keeps it in place and doesn't suffer from the V4 issues, is telling. Has anyone else tried this combo?

ETA: Has anyone looked inside the stock rear resonator? Is it a straight through unit or is it baffled?

Edited October 24, 2015 by SIG551A1

ClemsonFan · October 25, 2015

What are y'all doing for exhaust tips? 45's out each side? Straight out the back. Stock location? Dumped?

Pictures would be helpful.

Badass69 · October 26, 2015

Got my 3.5" MBRP on my truck today finally. The stocker came off nice because everything is so new and not driven lol. I just wiggled the factory exhaust out in one piece and threw it up for sale.... spent more time trying to get the GM 4" tip they just ram over the tailpipe off... Gave up as I will destroy that tip before it actually slides off. Had the new one on in about 20 minutes and took it for a drive. Drone is basically null and it just sounds good when you are on the throttle. Even in V4 I didn't notice really anything worth noting for drone. Needless to say I am happy with it.... until I put headers and no cats thus having straight pipe just like my one other truck... lol.

Sent from a potato

Edited October 26, 2015 by 1994Vmax

Txjose · October 26, 2015

ARH 1 7/8" headers with ORY ordered!!!

I'm going to give this new company called Carven Exhaust a shot with there TR muffler single 3" all the way back to the stock location with maybe some corsa style tips.....if i dn't like it ill shoot for a Borla XR1 or the 14" magnaflow.

I know its a 6.0 and mine is a 5.3 but this is just a beautiful sound to me lol

https://youtu.be/kvI7GmKqkm8

ClemsonFan · October 26, 2015

ARH 1 7/8" headers with ORY ordered!!!

I'm going to give this new company called Carven Exhaust a shot with there TR muffler single 3" all the way back to the stock location with maybe some corsa style tips.....if i dn't like it ill shoot for a Borla XR1 or the 14" magnaflow.

I know its a 6.0 and mine is a 5.3 but this is just a beautiful sound to me lol

https://youtu.be/kvI7GmKqkm8

I found this company about a month ago. Their "R" muffler is probably at the top of my list. If you search on YouTube you will find several videos of both the "R" and "TR" muffler on 2014 - 2015 trucks.

Txjose · October 26, 2015

I found this company about a month ago. Their "R" muffler is probably at the top of my list. If you search on YouTube you will find several videos of both the "R" and "TR" muffler on 2014 - 2015 trucks.

Oh i know its just that this particular setup hit the right note for me. Lol

Anastazi Sarigiannis · October 26, 2015

Decided to just go ahead and order the 38351 Dynomax system rather than hack up the stock exhaust. Figured the cost of a Magnaflow muffler and the labor to install it would put me at half the cost of a complete system.

Edited October 26, 2015 by SIG551A1

Dylan199 · October 26, 2015

I'm thinking about chopping the stock muffler out and putting in the 12229 magnaflow muffler in its place and keeping everything else in there. The flapper valve should help with the V4 buffeting/helicopter noise and the resonator will abate the resonance AKA "drone". Considering the GMPP Borla system keeps it in place and doesn't suffer from the V4 issues, is telling. Has anyone else tried this combo?

ETA: Has anyone looked inside the stock rear resonator? Is it a straight through unit or is it baffled?

I just put that same exhaust on my truck. I had the resonator removed and left the flapper in. The truck was extremely quiet that way. Even when I got on the throttle, I could hardly hear the exhaust. I immediately drove to OSH and bought a 2" hose clamp and opened the valve. I am now happy with the sound. I could hear the drone and it really bugged me. I programmed my truck to remove the AFM. Way better!!!!

Edited October 26, 2015 by Dylan199

Anastazi Sarigiannis · October 30, 2015

Got the 38531 Dynomax system and installed it yesterday at work. It was pretty easy to remove the old exhaust. Once unbolted we moved it back far enough to clear the middle cross-member, the pulled it out towards the front of the truck instead of trying to fish it over the rear axle. The new cat-back went on really easy and everything fit perfect. Only thing that was tricky was installing the tip LOL. It takes quite a bit of cinching down of the clamp on the tip to get it tight on the tailpipe, and the first clamp broke at the nut. Luckily it comes with an extra clamp if you have the longer bed so I just used that one and it tightened down fine.

The exhaust sounds great! It's not obnoxious but get your foot in it and it growls! their is a slight "chopper" now in V4 mode at some speeds, but not bad enough to worry about.

I also got the AirAid intake installed this morning and it adds some growl to the setup. Didn't get a chance to really drive aggressive with that yet, but it seems to smoothen things out. I am interested to see how the mileage improves with these two mods. A couple of MPG's would be great!

Rawyzf · October 30, 2015

Got the 38531 Dynomax system and installed it yesterday at work. It was pretty easy to remove the old exhaust. Once unbolted we moved it back far enough to clear the middle cross-member, the pulled it out towards the front of the truck instead of trying to fish it over the rear axle. The new cat-back went on really easy and everything fit perfect. Only thing that was tricky was installing the tip LOL. It takes quite a bit of cinching down of the clamp on the tip to get it tight on the tailpipe, and the first clamp broke at the nut. Luckily it comes with an extra clamp if you have the longer bed so I just used that one and it tightened down fine.

The exhaust sounds great! It's not obnoxious but get your foot in it and it growls! their is a slight "chopper" now in V4 mode at some speeds, but not bad enough to worry about.

I also got the AirAid intake installed this morning and it adds some growl to the setup. Didn't get a chance to really drive aggressive with that yet, but it seems to smoothen things out. I am interested to see how the mileage improves with these two mods. A couple of MPG's would be great!

The chopper sound eventually got to me with the Dynomax, so I said if I'm gonna have a chopper, I'm getting one with a bit more sound. So I just took out the VT muffler and put in a Flowmaster Super 40. Much happier now. I also have the Range AFM disabler, so no chopper unless I pull that out.

I am giong to convert to FFV soon and get a full tune and tune out AFM though.

Anastazi Sarigiannis · October 30, 2015

The chopper sound eventually got to me with the Dynomax, so I said if I'm gonna have a chopper, I'm getting one with a bit more sound. So I just took out the VT muffler and put in a Flowmaster Super 40. Much happier now. I also have the Range AFM disabler, so no chopper unless I pull that out.

I am giong to convert to FFV soon and get a full tune and tune out AFM though.

Yeah the nice thing is that with this system, you can easily put in any performance muffler with a center/offset layout in it's place if you wanna change it up.

tnchevy · October 30, 2015

It didn't take but a few days for me to get tired of the chopper sound with the dynomax VT while in V4 mode with light throttle. It was also way too quit to be an aftermarket exhaust at idle and low to med throttle. Did sound good at WOT though.

Rawyzf · October 30, 2015

Yeah the nice thing is that with this system, you can easily put in any performance muffler with a center/offset layout in it's place if you wanna change it up.

Exactly why I kept it!

Rawyzf · October 30, 2015

It didn't take but a few days for me to get tired of the chopper sound with the dynomax VT while in V4 mode with light throttle. It was also way too quit to be an aftermarket exhaust at idle and low to med throttle. Did sound good at WOT though.

I agree with most of this . I thought it was ok a Med throttle, but WOT all I could hear was air passing, not a thunderous roar ;).

Anastazi Sarigiannis · October 30, 2015

I agree with most of this . I thought it was ok a Med throttle, but WOT all I could hear was air passing, not a thunderous roar ;).

I think it sounds pretty good at WOT.

But anyway, for those on the fence about what exhaust to get, consider this:

You can buy this exhaust for $330, and a Magnaflow muffler (for example) for another $100, and end up with a Magnaflow exhaust and save yourself $450, over the $900 Magnaflow system. Don't get me wrong, I REALLY like Magnaflow products, but their price for a cat-back is ridiculous considering you can buy the same thing for almost 1/3 of the price.

Edited October 30, 2015 by SIG551A1