2019-2025
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 45 Minutes
Difficulty Level:
Light to Moderate mechanical skill required.
Installation Guides
No guide available for this part yet.
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AFE Apollo GT Series 3-Inch Muffler Upgrade (19-25 5.3L Silverado 1500)Find parts that fit my vehicle
Item S117073
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28 Reviews
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$236.00 kit
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Product Videos
(1)Noah: Hey, guys, it's Noah with AmericanTrucks. And I'm going to be talking to you about the AFE Apollo GT Series 3-Inch Muffler Upgrade, fitting the 2019 and newer 5.3-liter Silverado 1500. Now, if you want some more noise without paying for or installing a whole exhaust system, then a simple muffler upgrade would be a great choice for you. And this is going to fall at a three out of five on the wake-the-neighbors scale.When you think about an exhaust upgrade, usually you go right to a full system like a cat-back or an axle-back. Those larger exhaust upgrades are by far the most common, but they aren't for everybody. Now, if you just want a simple muffler upgrade in exchange for some more noise, but keep the rest of the exhaust factory, there are kits like this one from AFE, and they will do just that.Now, all you need to do is cut your factory muffler off and slap this guy in place like it never happened. So this muffler is very free-flowing and open on the inside, and you'll definitely get some more feeling in the pedal as well as some more sound, obviously. Now, the tubing here is actually 3-inch through the muffler and it's 3-inch diameter on this piece as well, so it's really going to open things up.Let's dive into this guy a little bit further. It's completely constructed from high-grade 304 stainless steel. The 304 stainless is the strongest grade of steel available as far as exhaust goes, and it's unbelievably resistant to corrosion and rust when you put it up against the elements. So this is a great option for you guys who live in the rust belt or in areas and places that have tons of salt in the roads with nasty brine like they do at my house.Now, like I said earlier, this is designed to be a direct muffler replacement, so this is built to fall right in place of the factory muffler. Now, everything you need as far as hangers and clamps are all stainless and they all come in the box. Now, last but certainly not least, this will come from AFE with a two-year warranty. The AFE Apollo GT Muffler costs around $260. Now, probably the best thing about a muffler upgrade like this is the price tag when it's compared to a full exhaust system, which would be drastically more expensive.Now, this is a great way to save a few dollars and avoid committing to a large install. Speaking of install, you're looking at a difficulty of two out of three wrenches, but only about a 45-minute install time. That difficulty is higher because of the fact that you need to cut your factory muffler out to replace it with this guy. It won't take you very long, though, and to help you with the install, next, we have an AT customer who's gonna walk you through the whole install process on their own Silverado.Man: All right, so the tools needed to complete this install, I'll be using two jack stands to secure the stock muffler while I remove it, a measuring tape to measure out my lines were to cut, a Sharpie marker to mark the lines, safety glasses while I make the cuts. To make the cuts, I'll be using a reciprocating saw with a 9-inch metal cutoff blade.After the muffler is removed, to clear off any loose burrs, I'll be removing those with a angle grinder and a flap disc. And to tighten down the clamps, initially, I'll be using a impact driver with a 15-millimeter deep socket. And then to make my final tightening, I'll be using a torque wrench to the specified specs. All right, we're going to be installing the AFE Power Apollo GT Muffler. This will be a direct replacement for the factory Silverado muffler.In the box, you'll get your muffler assembly, your adapter pipe two 2-3/4 clamps, and one 3-inch clamp, assembly instructions, and some stickers. All right, for the first step, we're gonna hit under the car and mount the muffler with jack stands. All right, with the jack stands in place, our next step is to mark our lines for our cutting. At the front of the muffler, our first line's gonna be as close as we can to the muffler, so I'm gonna cut it right in front of the weld here, and mark that with a marker if you need to. And at the rear of the muffler, we're gonna mark our line as well. We're gonna go 2-3/4. I'm gonna go from the rear of the weld here, mark in a couple different places.All right, for the next step, now that we have our lines marked, we have our muffler secure, we're gonna go ahead and cut the stock muffler off. We'll be using the reciprocating saw to do this. And for the front of the muffler, we're gonna be, like I said, marking that line, cutting as close as we can to the muffler. All right, now we'll go to the back and do the same thing.Okay. And at the rear of the muffler, we're gonna be cutting where we marked that line. That was 2-3/4 inches from the rear of the muffler. All right, with the front and rear cut, we can now remove the factory muffler, and that'll slide right out of there. Okay. And before I install the muffler, I'm gonna go ahead and take care of a few of these burrs that I have on the pipe. For that, I'm just gonna be using a flat disc on a angle grinder, and we'll get started. All right, that should take care of that.All right, we're now ready to install the AFE muffler. And for this, I'm gonna start at the rear. I'm gonna go ahead and slip the adapter pipe onto the rear section of the exhaust. And I'm gonna slide that back as far as I can until it won't go anymore. And then we're gonna move up to the front part of the exhaust. All right. And now at the front of the muffler, you'll have a little play in this pipe, it will be tight, but due to the flex pipe, you can actually move this out of the way and then kind of push the muffler over till everything's aligned.And then go ahead and slide your muffler all the way to the front. And then you wanna look to make sure that nothing's showing and that the pipe is covered. Everything looks good up here. Go ahead and position that how you want it, and then we'll look at the rear of the muffler. And just wanna make sure the pipe and everything is covered there, that there's no holes or gaps that air can come out of. Everything looks good there, and everything looks good at the rear as well.So now that everything's in place, you're gonna wanna make sure that your pipe is angled how you want it, that it's not touching anything. And this muffler is quite a bit smaller than the factory one. So clearance is definitely not an issue anywhere on it. All right, so then you can go ahead and position your clamps how you want them, and we'll go ahead and get our tools ready to tighten this down.All right, now it's time to tighten down our clamps. We're gonna kinda wanna do this with even pressure across starting at the front clamp. So again, this is a good time to double-check everything, make sure it's where you want it positioned. And with your 15-millimeter, go ahead and tighten that down. Okay, don't get too snug just yet, and we'll move to the rear and get those tightened as well.All right. At the rear section, you're gonna want to do the same thing to the rear two clamps. All right. And I'm just leaving about a quarter of an inch on each in there to play. And then we're gonna do the same to the very back clamp as well. Again, I'm just double-checking that everything's covered. Everything looks good. I'm gonna snug this down a little bit as well.All right. It looks like I will need a deep socket due to the bolt sticking out. So let me get that real quick. All right, with all the clamps in place, muffler's secure where I want it, I'm gonna go back to the front and tighten everything back down once more. All right, so back at the front. We're gonna go ahead and tighten this one down. All right, I'll go back to the rear. All right, we're gonna do the same thing to the rear clamps as well. And the last one. All right, we're solid.All right. And per the instructions, it does say to tighten these down 40 to 45 pounds-foot torque. So we're gonna go ahead and do that. There we go. And we're gonna go to the rear and do the same thing. All right. Do the same thing and tighten these down as well. And the last one. All right, everything's tightened down to 45-foot pounds per the directions. Everything is super solid. Everything looks good. The next step is to turn it on and check for any leaks.Noah: That was the AFE Apollo GT Series 3-Inch Muffler Upgrade, fitting the '19 and newer 5.3-liter Silverado 1500. For all things Silverado, go ahead and keep it right here at americantrucks.com.
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2019-2024 Silverado & Sierra 1500 AFE Apollo GT Series 3" Direct Fit Muffler Review & Sound Clip
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- AFE Apollo GT Series 3-Inch Muffler Upgrade
- Made from High-Quality Stainless Steel
- Direct Fitment
- Better Sound
- Less Air Restriction
- Better Heat Dissipation
- Two-Year Warranty
- Fits All 2019-2025 5.3L Silverado 1500 Models
| Brand | AFE |
| Muffler Inlet Size | 3.00 Inch |
Description
Improves Performance. Having a better airflow enhances the performance of your engine. This AFE Apollo GT Series 3-Inch Muffler Upgrade provides less air restriction compared to your stock muffler which means your engine can dump exhaust gasses sooner than a stock muffler can and generally improves the engine efficiency.
Better Sound. This muffler upgrade has been tuned to produce a bassy sound that complements the engine performance. Unlike other mufflers with no sound improvements or sometimes produce an overly aggressive sound, this muffler produces a gentle rumble that doesn't overpower the engine sound.
Durable Design. Made from high-grade 304 stainless steel, this muffler upgrade was designed to be durable to handle the extreme pressure, heat, and exposure to the outside elements. It was designed to have a hassle-free operation within its long service life. Its stainless steel material is for better heat dissipation and lightness for better weight reduction that has a direct effect on the overall performance of your vehicle.
Installation. No additional modifications are needed upon installation. It comes with all the necessary mounting hardware.
Warranty. This product comes with a 2-Year Warranty.
Application. This AFE Apollo GT Series 3-Inch Muffler Upgrade was designed to fit all 2019-2025 5.3L Silverado 1500 models.
Fitment:
- 2019 Chevrolet Silverado 1500
- 2020 Chevrolet Silverado 1500
- 2021 Chevrolet Silverado 1500
- 2022 Chevrolet Silverado 1500
- 2023 Chevrolet Silverado 1500
- 2024 Chevrolet Silverado 1500
- 2025 Chevrolet Silverado 1500
AFE 49C44121
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Muffler
- Mounting Hardware
4.5
Customer Reviews (28)
Review Summary
Installation Time: Less than 1 Hour
Mar 14, 2025
2022 High Country -
Perfect
Great way to give the 5.3 a nice rumble without breaking the bank or waking the neighbors but know when it’s there when you gas it. Also just enough to be able to cut off the flapper. Just added a few welds for a couple leaks I couldn’t get to close up and for security down the road.
Fit & Finish 5/5
Loudness (Volume) 3/5
Exhaust Note 4/5
Bang For Your Buck 5/5
Jan 28, 2025
2020 RST - GT1
Installation Time: Less than 1 Hour
Apollo
Easy to install, sounded as described. Nice cold start and slightly louder than stock with nice deep rumble when you get on the gas
Fit & Finish 5/5
Loudness (Volume) 3/5
Exhaust Note 4/5
Bang For Your Buck 5/5
Jan 6, 2025
2019 LT - AdamPA
Pretty ok
It just loud enough and was what I’m looking for. If I had a little more cash at the time I might have went for another option that included the tail pipe because of the resonators in my tail pipe section. All in all pleased with it for the price. 2019 Chevy Silverado
Fit & Finish 5/5
Loudness (Volume) 3/5
Exhaust Note 4/5
Bang For Your Buck 5/5
Sep 28, 2024
2021 - Rttttm
Installation Time: Less than 1 Hour
Easy install, perfect sound
Install was easy- just follow the video. No cabin drone, just a lower rumble especially at cold start. Truck now sounds like it should- tough but not obnoxious. And American trucks customer service was fantastic! Would highly recommend this product .
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 4/5
Bang For Your Buck 5/5
Aug 27, 2024
2023 High Country - Billt1177
Installation Time: Less than 1 Hour
Apollo GT Series
Very easy install, took about 30 minutes from start to finish. Seems to be very good quality. I however am very disappointed in the sound. I actually think it is quieter than the stock muffler that I removed. I will be looking for other options soon. The low stars given was for the sound only.
Fit & Finish 5/5
Loudness (Volume) 1/5
Exhaust Note 1/5
Bang For Your Buck 1/5
Jun 13, 2024
2022 - NicholasD
Installation Time: Less than 1 Hour
Apollo’s series muffler
Price was good even though it went on sale day after I purchased it for 40 less. Fitment was great and the directions were great. Little disappointed in sound as it’s not much louder then stock muffler I removed, will be looking into a different option with better sound.
Fit & Finish 5/5
Loudness (Volume) 2/5
Exhaust Note 2/5
Bang For Your Buck 4/5
May 26, 2024
2024 RST - KevinRobinson
Installation Time: Less than 1 Hour
AFE APOLLO GT MUFFLER
i installed this muffler on my 2024 chevy RST it took about a half hour it was pretty basic and it sounds pretty nice gave some tone especially on the take off not too loud in the cab at cruising speed the directions were very easy
Fit & Finish 5/5
Loudness (Volume) 4/5
Exhaust Note 4/5
Bang For Your Buck 5/5
Nov 24, 2023
2021 - Rodneysnead
Installation Time: Less than 1 Hour
Drone
I installed this muffler, yes it went on easy, took 30 mins. BUT!! IT HAS A BAD DRONE AT 1500 RPMS AT CRUSING SPEED. 60 MPH, IM ABOUT READY TO GET A DIFFERENT MUFFLER
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 3/5
Bang For Your Buck 1/5
Nov 22, 2023
2020 RST - HDbandit
Installation Time: Less than 1 Hour
Nice!!!
I decided to get this upgrade after I heard something rattling in the muffler. After I cut the muffler off, I realized it was the infamous GM flapper in the muffler after it broke off. This muffler sounds great, not too loud but very noticeable. Super easy to install with no leaks. I would definitely buy again.
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Bang For Your Buck 5/5
Nov 8, 2023
2021 Custom Trail Boss - Boatdronez
Installation Time: Afternoon
AFE for the win....
Great replacement muffler. Has a aggressive sound at start up,then quiets down to a nice low rumble tone. Not loud at all, and no drone in cab at speeds. Did slightly increase fuel economy with a performance air filter. Overall nice product.
Fit & Finish 5/5
Loudness (Volume) 2/5
Exhaust Note 4/5
Bang For Your Buck 5/5
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Will It Fit My Silverado 1500
- 5.3L V8 - 19, 20, 21, 22, 23, 24, 25
