We researched and compared the top exhaust systems for the 6.4 Hemi engine, focusing on sound quality, power gains, construction, and real owner feedback. Our evaluation covers cat-back, axle-back, and performance mufflers from leading brands. Whether you drive a Ram 2500/3500, Challenger, or Charger, this guide will help you choose the best exhaust for your 6.4 Hemi.
| Photo | Product | Score | Buy |
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Borla Atak Cat-Back Exhaust Top Pick Cat-back, 3-inch mandrel-bent T304 stainless steel, dual rear exit |
9.2 | 🛒 Check Price |
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Flowmaster Outlaw Cat-Back Exhaust Best for Aggressive Sound Cat-back, 3-inch mandrel-bent aluminized steel, single exit |
8.7 | 🛒 Check Price |
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MagnaFlow Street Series Cat-Back Exhaust Best Balanced Sound Cat-back, 3-inch mandrel-bent T304 stainless steel, dual split rear exit |
8.4 | 🛒 Check Price |
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Corsa Performance Sport Cat-Back Exhaust Best No-Drone Technology Cat-back, 3-inch mandrel-bent T304 stainless steel, dual rear exit, RSC technology |
8.1 | 🛒 Check Price |
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MBRP Armor Plus Cat-Back Exhaust Best Value Cat-back, 3-inch mandrel-bent aluminized steel, dual rear exit |
7.8 | 🛒 Check Price |
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Gibson Performance Cat-Back Exhaust Best for Trucks Cat-back, 3-inch mandrel-bent aluminized steel, single rear exit |
7.5 | 🛒 Check Price |
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Dynomax Performance Exhaust System Budget Pick Cat-back, 3-inch mandrel-bent aluminized steel, single exit |
7.3 | 🛒 Check Price |
1. Borla Atak Cat-Back Exhaust: Top Pick
The Borla Atak Cat-Back Exhaust is our top pick for the 6.4 Hemi. We researched owner feedback and manufacturer specs to confirm it delivers a loud, aggressive tone under throttle while remaining civil at cruising speeds. The T304 stainless steel ensures long-term durability, even in harsh climates. In our evaluation, the Atak system consistently received high marks for power gains, with owners reporting improved throttle response and a deeper exhaust note.
However, this system is not for everyone. Its aggressive sound may be too loud for daily drivers or those with noise-sensitive neighbors. Also, the premium price is a barrier for budget-conscious buyers. If you prioritize a refined, moderate sound, consider skipping this pick in favor of a touring-style exhaust.
- Aggressive, race-inspired sound with no drone on the highway
- T304 stainless steel construction for maximum corrosion resistance
- Direct bolt-on installation with no cutting or welding required
Pros: Excellent build quality and fitment; Noticeable horsepower and torque gains
Cons: Premium price point may not suit all budgets
2. Flowmaster Outlaw Cat-Back Exhaust: Best for Aggressive Sound
The Flowmaster Outlaw Cat-Back Exhaust is designed for those who want maximum volume and aggression. Our research shows it uses a straight-through design with minimal sound dampening, producing a raw and loud exhaust note. Owner feedback confirms significant power gains, especially at high RPMs. The aluminized steel construction keeps costs down, making it an attractive option for budget-minded enthusiasts.
But there are trade-offs. The aluminized steel will not last as long as stainless steel in corrosive environments, so rust may become an issue over time. Additionally, the extreme loudness can cause drone on the highway and may not be legal in all areas. If you need a quieter, more refined exhaust, skip this one.
- Extremely loud, race-inspired exhaust note
- Straight-through design maximizes flow and power
- Affordable compared to stainless steel systems
Pros: Very aggressive sound that turns heads; Good value for the price
Cons: Aluminized steel prone to rust in salt-belt regions; Can be too loud for some daily drivers
3. MagnaFlow Street Series Cat-Back Exhaust: Best Balanced Sound
The MagnaFlow Street Series Cat-Back Exhaust strikes a great balance between performance and daily drivability. We compared it against other systems and found its sound to be deep and muscular without being obnoxious. The T304 stainless steel construction and lifetime warranty provide peace of mind. Owner feedback highlights a noticeable improvement in throttle response and a clean, aggressive tone under acceleration.
However, if you want the loudest possible exhaust, this system may leave you wanting more. Its refined sound is better suited for those who want a performance upgrade without drawing too much attention. Also, the price is on the higher side. Consider this if you prioritize longevity and a balanced exhaust note.
- Deep, smooth tone without excessive drone
- Lifetime warranty on T304 stainless steel construction
- Easy bolt-on installation with included hardware
Pros: Excellent build quality and warranty; Great sound balance between aggressive and civil
Cons: May not be loud enough for those seeking extreme volume; Premium price similar to Borla
4. Corsa Performance Sport Cat-Back Exhaust: Best No-Drone Technology
The Corsa Performance Sport Cat-Back Exhaust is engineered with RSC (Reflective Sound Cancellation) technology to eliminate drone while still providing a bold exhaust note. Our research shows it is particularly popular among 6.4 Hemi owners who spend a lot of time on the highway. The T304 stainless steel construction ensures durability, and the polished tips add a premium look. Owner feedback confirms a clean, aggressive sound under load with zero interior resonance.
On the downside, the price is steep, and some owners find the sound too refined for their taste. If you want a raw, raspy exhaust, this may not satisfy. Additionally, installation can be trickier than some systems due to tight tolerances. Skip this if budget is a primary concern or if you prefer a louder, more traditional muscle car tone.
- Patented RSC technology eliminates drone
- Aggressive sound at wide-open throttle
- High-quality T304 stainless steel with polished tips
Pros: No drone at any RPM; Great fitment and finish
Cons: Expensive compared to similar systems; Sound may be too mild for some enthusiasts
5. MBRP Armor Plus Cat-Back Exhaust: Best Value
The MBRP Armor Plus Cat-Back Exhaust offers a compelling balance of performance and affordability. We compared it to pricier systems and found it delivers a deep, aggressive tone that many 6.4 Hemi owners appreciate. The aluminized steel construction helps keep costs low, and the mandrel-bent tubing ensures smooth flow. Owner feedback indicates noticeable power gains and a satisfying exhaust note.
However, the aluminized steel is not as corrosion-resistant as stainless steel, so this system may not be ideal for those in snowy or coastal areas. Some owners also report minor fitment issues requiring adjustment. If you want a long-lasting, rust-proof system, invest in a stainless steel option. This is a great pick for budget-conscious buyers who can accept some trade-offs.
- Affordable price without sacrificing sound quality
- Deep, aggressive tone with moderate drone
- Includes all necessary hardware for installation
Pros: Excellent value for the price; Good sound improvement over stock
Cons: Aluminized steel may rust over time; Fitment can be slightly off on some models
6. Gibson Performance Cat-Back Exhaust: Best for Trucks
The Gibson Performance Cat-Back Exhaust is tailored for Ram HD trucks with the 6.4 Hemi. We researched its design and found it focuses on improving low-end torque, which is beneficial for towing and hauling. The single exit configuration keeps things simple, and the sound is a deep, mellow rumble without being overly loud. Owner feedback from truck owners is positive, with many noting improved throttle response and a more muscular sound.
However, this system may not satisfy those seeking an aggressive, high-volume exhaust. It is also made from aluminized steel, which can corrode over time. If you drive a Ram 2500/3500 and want a practical performance upgrade, this is a solid choice. But if you want maximum sound or live in a rust-prone area, consider stainless steel alternatives.
- Deep, mellow tone ideal for trucks
- Improves low-end torque for towing
- Direct fit for Ram 2500/3500 with 6.4 Hemi
Pros: Designed specifically for heavy-duty Rams; Noticeable torque improvement
Cons: Aluminized steel not as durable as stainless; Sound may be too quiet for some
7. Dynomax Performance Exhaust System: Budget Pick
The Dynomax Performance Exhaust System is the most budget-friendly option we researched for the 6.4 Hemi. It delivers a deeper, more aggressive sound than stock without breaking the bank. The mandrel-bent tubing ensures good flow, and the direct-fit design makes installation straightforward. Owner feedback highlights it as a great entry-level upgrade for those new to exhaust modifications.
However, the aluminized steel construction means it will not last as long as stainless steel, especially in wet or salty conditions. Additionally, some owners note drone at cruising speeds, which can be annoying on long trips. If you have the budget for a stainless steel system, we recommend investing in one for better longevity. This is best for those on a tight budget or who plan to keep the vehicle for a shorter time.
- Most affordable option on our list
- Produces a deep, aggressive sound
- Easy installation with factory hangers
Pros: Very budget-friendly; Improves exhaust note noticeably
Cons: Aluminized steel is prone to rust; Some owners report drone at highway speeds
Frequently Asked Questions
Will a cat-back exhaust void my warranty?
In most cases, a cat-back exhaust will not void your vehicle’s warranty, as it is a bolt-on modification that does not affect the engine or emissions system. However, if a failure occurs that is directly caused by the exhaust, the dealer may deny coverage. We recommend checking with your dealer and keeping the stock parts just in case.
How much horsepower can I expect from a 6.4 Hemi exhaust?
Based on our research and owner feedback, a cat-back exhaust typically adds 5-15 horsepower to the 6.4 Hemi, with most gains coming from improved flow and reduced backpressure. The exact increase depends on the exhaust design and your vehicle’s other modifications. Real-world gains are often more noticeable in throttle response and sound than peak dyno numbers.
What is the difference between cat-back and axle-back exhaust?
A cat-back exhaust replaces the entire system from the catalytic converter back to the exhaust tips, including the muffler and piping. An axle-back exhaust only replaces the components from the rear axle to the tips, leaving the main muffler in place. Cat-backs offer greater sound and performance improvements, while axle-backs are simpler and cheaper but provide less benefit.
Will a louder exhaust affect my truck's towing capability?
No, a properly designed cat-back exhaust will not negatively affect towing capability. In fact, some systems like the Gibson Performance Cat-Back are designed to improve low-end torque, which can aid in towing. However, extremely loud exhausts may be annoying during long towing trips. Choose a system with minimal drone for a more comfortable towing experience.
How do I choose between aluminized steel and stainless steel?
Stainless steel (T304 or T409) offers superior corrosion resistance and a longer lifespan, making it ideal for vehicles driven in wet, salty, or coastal environments. Aluminized steel is cheaper but more prone to rust over time. If you plan to keep your vehicle for many years or live in a harsh climate, we recommend stainless steel. For a budget-friendly upgrade on a short-term vehicle, aluminized steel is acceptable.
Our Verdict
After researching and comparing the top exhaust systems for the 6.4 Hemi, our top pick is the Borla Atak Cat-Back Exhaust for its exceptional build quality, aggressive sound, and proven performance gains. For those seeking a more balanced option, the MagnaFlow Street Series is an excellent runner-up, offering a deep tone with no drone and a lifetime warranty. Consider your priorities for sound, durability, and budget when making your final decision.
Last reviewed and spec-checked: June 14, 2026. We re-check our picks and listings periodically.
