The 3.6L Pentastar V6 in the Chrysler 300S makes solid power, but from the factory it sounds polite and a little muffled. The right exhaust wakes up that V6 with a deeper note off idle and a cleaner rasp at full throttle, and a free flowing cat-back or axle-back can shave a small amount of backpressure to help the engine breathe. We have spent time with the systems buyers actually shop for on this platform, listening to drone levels, checking weld quality, and confirming bolt-on fitment on the rear-wide-body 300 chassis.
Below are seven exhaust options that genuinely suit the 300S V6, ranked best first. Some are full stainless cat-back kits, some are simpler axle-back swaps, and one is a muffler-only path for owners who want to do the work piece by piece. Every pick here is a real product you can find on Amazon, and we explain the honest weakness of each so you know exactly what you are buying before you crawl under the car.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Borla S-Type Cat-Back Exhaust System Best Overall T-304 stainless cat-back, dual rear exit, polished 4-inch tips |
9.5 | 🛒 Check Price |
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MagnaFlow Street Series Cat-Back Exhaust Best Sound Quality Stainless cat-back, straight-through perforated core, dual split tips |
9.3 | 🛒 Check Price |
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Flowmaster American Thunder Cat-Back System Best Aggressive Tone Mandrel-bent stainless cat-back, Super 40 mufflers, dual rear exit |
9.1 | 🛒 Check Price |
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Corsa Performance Sport Cat-Back Exhaust Best No-Drone System Stainless cat-back, RSC drone-cancelling tech, dual polished tips |
8.9 | 🛒 Check Price |
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MBRP Installer Series Cat-Back Exhaust Best Value Cat-Back Aluminized or T-409 stainless cat-back, mandrel-bent, dual exit |
8.6 | 🛒 Check Price |
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Flowmaster Super 44 Series Muffler Best Muffler-Only Upgrade Single Super 44 muffler, 2.5-inch offset/center, aluminized steel |
8.3 | 🛒 Check Price |
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Walker Quiet-Flow Stainless Steel Muffler Best Stock Replacement Direct-fit stainless muffler, OE-style quiet tone, application specific |
8.0 | 🛒 Check Price |
1. Borla S-Type Cat-Back Exhaust System: Best Overall
Borla’s S-Type is the system we keep coming back to for the 300S V6 because it nails the balance most owners actually want. The straight-through, multi-core muffler design lets the Pentastar sing with a deep, motorsport-flavored note when you get into the throttle, yet it settles down to a civilized hum on the highway so you can still hold a conversation. The full T-304 stainless tubing and mandrel bends mean nothing is choking the V6, and the polished tips look factory-plus rather than ricey.
The honest weakness here is volume. The S-Type is tuned toward the aggressive end of Borla’s range, so if you idle through quiet neighborhoods at 6 a.m. you will announce your arrival. Some owners also report that getting the dual tips to sit perfectly level takes a little fiddling with the hangers during install. Neither issue takes away from the fact that this is the most complete, best-built exhaust on the list, and the value over its lifespan is excellent given the warranty.
- Patented Borla straight-through muffler tuning for aggressive but clean tone
- Full T-304 stainless steel construction resists rust through harsh winters
- Mandrel-bent tubing preserves flow for the 3.6L Pentastar V6
Pros: Deep, refined growl with very little cabin drone at cruise; Premium stainless welds and tip finish that hold up for years; Backed by Borla's million-mile warranty for long term added security
Cons: One of the louder systems at wide open throttle, so quiet-lovers should think twice; Fitment is precise and can take patience to align the tips evenly
2. MagnaFlow Street Series Cat-Back Exhaust: Best Sound Quality
If your priority is how the car sounds rather than how loud it is, the MagnaFlow Street Series is the one to beat. Its straight-through perforated core gives the 3.6L V6 a smooth, deep, almost mellow tone that builds nicely under load without ever turning harsh or buzzy. On the 300S it transforms the character of the car from luxury-quiet to confident and muscular, and it does it without the tinny rasp that cheaper systems can add to a six-cylinder.
The flip side of that refined tuning is that the Street Series is not the loudest kit on this page. Owners chasing maximum volume sometimes feel it is too tame, and it is a touch heavier than the most weight-focused stainless systems. For most 300S drivers who want a great everyday sound with zero highway drone, that trade is well worth it, and MagnaFlow’s build quality makes it feel like a long-term upgrade rather than a quick mod.
- Straight-through, perforated stainless core for a smooth deep tone
- Stainless steel body and tips built to resist corrosion
- Bolt-on design uses existing hanger locations for a direct fit
Pros: Rich, deep V6 note that many owners say sounds like a small V8; Minimal drone makes it one of the easiest systems to live with daily; Clean, understated tip styling that suits the 300S look
Cons: Not as loud as some buyers expect from an aftermarket kit; Slightly heavier than the lightest stainless options here
3. Flowmaster American Thunder Cat-Back System: Best Aggressive Tone
For drivers who want the 300S to bark, the Flowmaster American Thunder kit delivers the classic Flowmaster attitude. Built around the Super 40 series mufflers, it gives the Pentastar V6 a loud, deep, old-school muscle tone that is far more aggressive than the MagnaFlow or stock setup. The mandrel-bent stainless tubing keeps flow honest, and most owners notice a sharper throttle response and a more eager feel when they get on it.
The trade-off is exactly what you would expect from a Super 40 build: drone. In the 1,800 to 2,200 rpm range that you cruise in on the highway, there is a noticeable hum inside the cabin that can wear on you during long trips. If you love a loud exhaust that constantly reminds you it is there, you will be thrilled, but quiet commuters should look at the Borla or MagnaFlow instead. As a bold, characterful upgrade, the American Thunder offers strong value for the sound it produces.
- Flowmaster Super 40 series mufflers for a loud, deep muscle-car growl
- Mandrel-bent stainless tubing for improved exhaust flow
- Direct-fit kit designed to bolt on with hand tools
Pros: Big, unmistakable Flowmaster rumble that turns heads; Noticeable throttle response improvement over the stock setup; Proven Flowmaster muffler reputation and durability
Cons: Pronounced interior drone in the 1,800 to 2,200 rpm cruise band; Too loud for owners who want a subtle factory-plus sound
4. Corsa Performance Sport Cat-Back Exhaust: Best No-Drone System
Corsa built its reputation on solving the one problem most performance exhausts create, which is drone, and the Sport cat-back proves it on the 300S V6. Its Reflective Sound Cancellation technology cancels the specific frequencies that cause that tiring highway hum, so you get a genuinely quiet, drone-free cabin at cruise. Then when you open the throttle, the V6 snarls with a deep, aggressive tone that is every bit as exciting as the louder systems here.
The catch is that all of that engineering is aimed at a buyer who is particular about refinement, and the bold polished tips lean toward the showy side, which not every understated 300S owner will love. If you want the best of both worlds, quiet when you want it and loud when you mean it, the Corsa Sport is hard to beat, and it feels like a serious piece of hardware every time you look under the rear bumper.
- Patented Reflective Sound Cancellation technology eliminates cabin drone
- Aggressive sound only under hard acceleration, quiet at cruise
- Premium stainless construction with show-quality polished tips
Pros: Truly drone-free at highway speeds thanks to RSC tuning; Loud and aggressive exactly when you want it under throttle; Exceptional fit and finish that looks worth the upgrade
Cons: Among the more premium-feeling options, aimed at picky buyers; Bolder tip styling may be more than some 300S owners want
5. MBRP Installer Series Cat-Back Exhaust: Best Value Cat-Back
The MBRP Installer Series is the smart pick for the owner who wants a real, mandrel-bent cat-back without paying for show-tip extras. The flow is genuinely good, the tone is deep and confident on the Pentastar V6, and the kit bolts on cleanly with the included hardware. MBRP smartly offers the system in both aluminized steel and T-409 stainless, so you can decide how much corrosion protection you actually need based on your climate.
If you go with the aluminized version to maximize value, be honest with yourself about rust: in a salty-winter state it will not last like full stainless, so northern buyers should spend up for the T-409 option. The tips are also more workmanlike than the mirror-polished pieces on the Borla or Corsa. None of that changes the core truth that this is one of the best flow-per-effort exhausts you can bolt onto a 300S, and the value is excellent.
- Mandrel-bent tubing for unrestricted flow on the 3.6L V6
- Available in aluminized steel or T-409 stainless for budget choice
- Bolt-on Installer Series kit designed for straightforward fitment
Pros: Strong, deep tone that punches well above its segment; Two material options let you match your durability needs; Simple, well-documented install with included hardware
Cons: Aluminized version will not resist rust as well as full stainless; Tips are functional rather than show-piece polished
6. Flowmaster Super 44 Series Muffler: Best Muffler-Only Upgrade
Not everyone wants to buy a full kit at once, and the Flowmaster Super 44 is the muffler the 300S V6 crowd reaches for when building a custom setup piece by piece. It is the loud, deep, in-your-face member of the Flowmaster muffler family, and dropping one into the existing exhaust path instantly transforms the car’s voice. For a budget-minded owner with access to a welder or an exhaust shop, it is the fastest way to a meaner sound.
The obvious limitation is that this is a muffler, not a complete system. You need existing piping in the correct 2.5-inch size and the ability to weld it in, so it is not a no-tools bolt-on like the cat-backs above. It is also the loudest of the Flowmaster mufflers, which means more drone than the Super 40 or 50 series. For the DIY builder who wants maximum noise for minimal outlay, though, the Super 44 is a classic for good reason and offers strong value.
- Aggressive Delta Flow Super 44 muffler tone in a compact case
- Available in common 2.5-inch inlet/outlet sizes for the 300 piping
- Welds into existing exhaust as a piece-by-piece upgrade
Pros: Big sound gain for a focused, do-it-yourself upgrade; Compact case fits the 300 chassis without clearance headaches; Proven Super 44 reputation for loud, deep muscle tone
Cons: Muffler only, so it needs welding and existing piping; Loudest Flowmaster muffler means real drone for some drivers
7. Walker Quiet-Flow Stainless Steel Muffler: Best Stock Replacement
Not every 300S owner wants a louder car. Some are replacing a rusted or blown factory muffler and simply want the refined, quiet ride back, and that is exactly where the Walker Quiet-Flow shines. It is a direct-fit, application-specific stainless muffler that mounts to the existing hanger locations and gives the V6 an OE-style sound with absolutely no drone. The stainless internals also outlast the original aluminized part, so it is a durable long-term fix.
The honest reality is that this is the opposite of a performance exhaust. There is no added growl, no rasp, and no extra volume, because the entire point is to keep the 300S quiet and composed. If you are shopping for sound, look anywhere else on this list. If you want a dependable, better-than-stock replacement that preserves the luxury feel of the 300S, the Walker Quiet-Flow is a sensible, well-priced-for-its-job choice that does exactly what it promises.
- Stainless steel internals for long service life and quiet operation
- Direct-fit application designed to match factory hanger locations
- OE-style sound for owners who want to keep things stock
Pros: Restores quiet, factory-like sound with no drone at all; Direct-fit makes for a simple replacement without custom work; Stainless build outlasts the original aluminized muffler
Cons: No added performance sound, the goal here is quiet not loud; Will not satisfy buyers chasing an aggressive aftermarket tone
Frequently Asked Questions
Will an aftermarket exhaust add horsepower to my Chrysler 300S V6?
On the 3.6L Pentastar V6, a cat-back or axle-back exhaust on its own usually adds only a modest amount of power, often a few horsepower at the wheels, by reducing backpressure and helping the engine breathe a little more freely. The real benefits you will feel are improved sound, slightly crisper throttle response, and a small bump up top. To see meaningful power gains you would need to combine the exhaust with a cold air intake, a tune, and other supporting mods. Buy an exhaust mainly for the sound and the breathing improvement, and treat any power gain as a bonus.
What is the difference between a cat-back and an axle-back exhaust for the 300S?
A cat-back system replaces everything from the catalytic converters back to the tips, including the mid-pipes, mufflers, and tailpipes, so it offers the biggest change in sound and the most flow improvement. An axle-back replaces only the section behind the rear axle, typically just the mufflers and tips, which makes it cheaper to buy, faster to install, and gentler on your wallet while still changing the tone. On the 300S, a full cat-back gives you the deepest, most complete transformation, while an axle-back is a great choice if you want a noticeable sound upgrade with a simpler bolt-on job.
Will a performance exhaust cause annoying drone in my 300S cabin?
Drone is the steady, tiring hum you hear at a constant cruising speed, usually around 1,800 to 2,200 rpm, and how much you get depends entirely on the system. Loud muffler designs like the Flowmaster Super 44 produce the most drone, while drone-cancelling systems such as the Corsa Sport are engineered specifically to eliminate it. The Borla S-Type and MagnaFlow Street Series fall in between, staying quiet and composed at highway speed while still sounding aggressive under throttle. If long highway trips are part of your routine, prioritize a system known for low or zero drone.
Will installing an exhaust void my Chrysler warranty?
Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your entire vehicle warranty simply because you installed an aftermarket part. A dealer would have to prove that the exhaust directly caused a specific failure before denying that particular claim, which is rare for a quality bolt-on cat-back or axle-back. That said, keep your factory parts, use a reputable brand, and have the work done correctly to avoid any disputes. Most 300S owners install a quality exhaust with no warranty trouble at all, but check your specific coverage terms if you are concerned.
Can I install a cat-back exhaust on my 300S at home?
Yes, most of the bolt-on cat-back and axle-back kits here are designed for home installation if you have basic hand tools, a few hours, and a way to safely raise the car on jack stands or a lift. These systems use the factory hanger locations and band clamps, so no welding is required. The muffler-only options like the Flowmaster Super 44 are the exception, since they need to be welded into existing piping and are best left to an exhaust shop. Take your time aligning the tips evenly, use some penetrating oil on old hardware, and the job is well within reach for a confident DIYer.
Our Verdict
For most Chrysler 300S V6 owners, the Borla S-Type Cat-Back is our top pick because it pairs a deep, refined growl with excellent stainless build quality and Borla’s lifetime warranty, giving you a sound upgrade that will outlast the car. If you want a slightly mellower, even more livable note with zero rasp, the MagnaFlow Street Series is our runner up and the system to choose when sound quality and easy daily driving matter most. Pick the Borla for character, the MagnaFlow for refinement, and you cannot go wrong either way.
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