Exhaust and dealer question

[clg82]

I'm thinking about upgrading our 2023 Trail Boss exhaust with something aftermarket. After reading horror stories on lifter issues, I am hesitant to change anything until after the warranty period if us by the chance they try and blame it on that. Anyone have opinions on this? Or should I not be worried about the 2023 lifters if they were all replaced with the correct ones? Thanks!

 

[Scottnweeze]

The dealership needs to prove causation that an aftermarket adjustment/part caused any failure to deny warranty, and on top of that lifter failure is a known issue. No way an aftermarket cat back could cause much of anything but irritated neighbors!! I installed a Borla cat back and CAI first week after doing the research , like you're doing. Enjoy your new truck, its a beauty!!!

 

[clg82]

Thanks Scott! We are loving it so far! What made you decide on the Borla if you don't mind me asking? My limited research says that GM has valves in the stock exhaust...is that correct? And if so does an aftermarket catback exhaust eliminate those?

 

[That21TrailBossguy]

Thanks Scott! We are loving it so far! What made you decide on the Borla if you don't mind me asking? My limited research says that GM has valves in the stock exhaust...is that correct? And if so does an aftermarket catback exhaust eliminate those?

I went with Borla. Those valves are in the pipe right before the muffler and will be removed

 

[Scottnweeze]

A couple of reasons: I'm planning on keeping this truck for a long time and wanted to do things once, and right. Borla is certainly one of the best out there, though you do pay the price ( I don't think I'll ever need the million mile warranty ), the materials and quality of the build are outstanding. There are lots of ways to go for most any budget, as a quick search on the forum will tell you, but in the 7 months I was waiting for my truck I saved up and purchased the Borla (S) Exhaust and a Diamondback Tonneau cover and I've never second guessed the decisions.
Regarding the stock exhaust valves, my understanding is they are pre-muffler and so in my case they were eliminated... but the much greater minds on the forum will set us both strait to be sure.

 

[clg82]

What is the reasoning behind the valves? I know in my ZL1 Camaro they are used to quiet the exhaust down depending on driving modes, do they serve the same function for the Silverado?

 

[clstark7]

I'm thinking about upgrading our 2023 Trail Boss exhaust with something aftermarket. After reading horror stories on lifter issues, I am hesitant to change anything until after the warranty period if us by the chance they try and blame it on that. Anyone have opinions on this? Or should I not be worried about the 2023 lifters if they were all replaced with the correct ones? Thanks!

My lifters went out when I already had aftermarket exhaust and a cold air intake, and the dealership replaced them with no questions asked. The Magnuson-Moss Warranty Act states that a manufacturer cannot deny warranty coverage due to the presence of aftermarket parts, unless they can prove that the aftermarket part is the source of the issue in question.

 

[clstark7]

What is the reasoning behind the valves? I know in my ZL1 Camaro they are used to quiet the exhaust down depending on driving modes, do they serve the same function for the Silverado?

The valve is to quiet down the engine when DFM or AFM cylinder deactivation is active. Otherwise it would sound like a lawn mower lol.

 

[PennStateLarry]

I'm thinking about upgrading our 2023 Trail Boss exhaust with something aftermarket. After reading horror stories on lifter issues, I am hesitant to change anything until after the warranty period if us by the chance they try and blame it on that. Anyone have opinions on this? Or should I not be worried about the 2023 lifters if they were all replaced with the correct ones? Thanks!

If you custom ordered your TrailBoss from GM and elected to have the GM Performance Exhaust installed as an option, what your getting is the Borla Touring Exhaust. Im actually having it installed with the black quad tips tomorrow. There is no worry of exhaust causing lifter issue or voiding factory warranty. Reason why i went with the Borla Touring, quality, warranty and i didnt want anythig to loud or the dreaded exhaust drone.

 

[Buschman]

I also had my dealer install the GM performance exhaust made by Borla. I even bought it off eBay no questions asked. Came in a unopened box labeled with GM part No. 84964744 They only charged $150 to remove old and install new.

 

[clg82]

The valve is to quiet down the engine when DFM or AFM cylinder deactivation is active. Otherwise it would sound like a lawn mower lol.

haha that makes sense, I've been looking at the Borla as well as the AWE catback exhaust, only concern with any aftermarket exhaust is when towing I don't want to hear the constant sound of the aftermarket exhaust in the higher RPM ranges.

 

[Scottnweeze]

haha that makes sense, I've been looking at the Borla as well as the AWE catback exhaust, only concern with any aftermarket exhaust is when towing I don't want to hear the constant sound of the aftermarket exhaust in the higher RPM ranges.

I have the Borla S and really have not found towing to be a problem with it, though I was a bit concerned prior to towing that it would be. I think it probably has to do with the 10 speed tranny. Even with the 6K plus trailer, and in tow mode I don't see those high rpms that would make it sing. I live in the Rockies at 6700 ft, and usually head uphill to camping so you think it would be worse. This is with the 5.3 BTW. I would certainly think twice before getting the Borla Atak on a 6.2... All in I've found the Borla S to be very manageable sound wise. Great at cold start with an immediate settle down and if I want to sound like a 6.2 it's just a pedal stomp away!!

 

[clg82]

I have the Borla S and really have not found towing to be a problem with it, though I was a bit concerned prior to towing that it would be. I think it probably has to do with the 10 speed tranny. Even with the 6K plus trailer, and in tow mode I don't see those high rpms that would make it sing. I live in the Rockies at 6700 ft, and usually head uphill to camping so you think it would be worse. This is with the 5.3 BTW. I would certainly think twice before getting the Borla Atak on a 6.2... All in I've found the Borla S to be very manageable sound wise. Great at cold start with an immediate settle down and if I want to sound like a 6.2 it's just a pedal stomp away!!

Thanks for the input, the Borla S-Type I have on my ZL1 works as you describe as well. But that car has actuated valves as well, so I didn't know if eliminating the valve on the TB would make it worse.

 

[carneyna]

I have AWE exhaust on my 2022 5.3 TB and love it. It looks great with the quad black tips and sounds amazing. AWE has the "no drone" technology that really does work. You have the nice deep exhaust notes when getting on it but once your at highway cruising speed you don't even hear it. I had Flowmasters on my Monte Carlo SS and the interior drone was irritating for sure.

 

[JP20TB]

Just order the AWE system for my 2020 TB 5.3 with the black quad tips … and it’s 3 inch throughout is what I was wanting …seems to be highly recommended..