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Top 10 Exhaust Systems for the 2020–2026 Chevrolet Silverado 2500/3500 HD
An aftermarket exhaust is one of the most popular upgrades for the HD Silverado, improving flow and tone across both the 6.6L L8T gas V8 and 6.6L Duramax turbo-diesel V8. Here are ten top-rated systems for this generation.
Important: All diesel exhaust products in this guide retain the factory diesel particulate filter (DPF), selective catalytic reduction (SCR), and EGR system. Products that remove or bypass diesel emissions equipment (“deletes”) are illegal for on-road use under EPA regulations, and we do not recommend or review them.
1. Borla S-Type Cat-Back Exhaust (L8T Gas V8)
⭐⭐⭐⭐½ (4.6/5) — Badge: Best Overall (Gas)
“Borla’s stainless construction and tuned resonance chamber deliver a substantial V8 tone without becoming a drone at highway speed.”
The S-Type system uses full stainless steel piping and mufflers, engineered specifically to avoid the interior cabin drone that plagues many aftermarket exhausts during steady highway cruising or long tows.
For L8T gas V8 owners, this is one of the most consistently recommended cat-back systems for balancing a noticeable tone improvement with everyday drivability and towing use.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L L8T gas V8 |
| Material | T-304 stainless steel |
| Type | Cat-back |
| Install Time | 1–2 hours |
Pros
- Stainless steel resists corrosion long-term
- Minimal highway drone
- Substantial, well-tuned V8 tone
Cons
- Premium pricing
- L8T-specific fitment
Price Range: $600–$820
2. MBRP 4″ Cat-Back Exhaust (Duramax Diesel)
⭐⭐⭐⭐½ (4.6/5) — Badge: Best Overall (Duramax)
“A larger-diameter cat-back system that reduces backpressure downstream of the DPF while keeping every factory emissions component fully intact.”
MBRP’s 4″ cat-back system for the Duramax increases pipe diameter from the factory system, reducing exhaust backpressure after the diesel particulate filter — genuinely useful for reducing strain on the engine during heavy towing — while leaving the DPF, SCR, and all emissions equipment completely unmodified.
This is one of the most popular Duramax exhaust upgrades specifically because it delivers a real functional and tonal benefit without venturing anywhere near emissions-illegal modifications.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L Duramax diesel V8 |
| Material | Aluminized or stainless steel options |
| Type | Cat-back (retains DPF, SCR, EGR) |
| Install Time | 1–2 hours |
Pros
- Reduces backpressure downstream of the DPF
- Fully retains factory emissions equipment
- Popular, well-proven Duramax upgrade
Cons
- Premium pricing for the stainless version
- Diesel-specific fitment
Price Range: $480–$680
3. AFE Large Bore-HD Exhaust System (Duramax Diesel)
⭐⭐⭐⭐ (4.3/5) — Badge: Best for Towing (Duramax)
“Larger diameter piping designed to reduce backpressure for owners towing near the truck’s substantial rated capacity.”
aFe’s Large Bore-HD line uses a larger pipe diameter than the factory system, targeting reduced backpressure benefits for owners who tow near the HD Silverado’s maximum capacity and want a measurable functional benefit alongside the tone improvement.
The mandrel-bent aluminized or stainless tubing options provide some budget flexibility, and the system is fully compatible with the factory DPF and SCR emissions equipment.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L Duramax diesel V8 |
| Material | Aluminized or stainless options |
| Type | Cat-back (retains DPF, SCR, EGR) |
| Install Time | 1–2 hours |
Pros
- Larger diameter reduces backpressure under heavy load
- Fully emissions-compliant
- Available in stainless or aluminized
Cons
- Premium pricing
- Diesel-specific fitment
Price Range: $520–$720
4. MagnaFlow Street Series Cat-Back (L8T Gas V8)
⭐⭐⭐⭐½ (4.5/5) — Badge: Best Stainless Option (Gas)
“Full stainless construction for owners who want a deeper tone without worrying about long-term corrosion.”
MagnaFlow’s Street Series for the L8T uses stainless steel throughout, a step up in material durability from more common aluminized steel exhausts.
The straight-through perforated core design maximizes flow while keeping the tone purposeful without becoming excessively loud at idle — a good match for a work truck that’s also frequently used for towing.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L L8T gas V8 |
| Material | Stainless steel |
| Type | Cat-back |
| Install Time | 1–2 hours |
Pros
- Full stainless steel, excellent longevity
- Reasonable tone for daily driving/towing
- Well-established performance brand
Cons
- Premium pricing
- L8T-specific fitment
Price Range: $520–$700
5. Banks Power Monster Exhaust (Duramax Diesel)
⭐⭐⭐⭐½ (4.5/5) — Badge: Best Diesel-Specific Engineering
“Banks built its reputation specifically on diesel exhaust systems, and the turbo-diesel-specific flow engineering shows.”
Banks Power’s Monster Exhaust system is engineered specifically around the flow characteristics of a turbocharged diesel exhaust, downstream of the DPF and SCR system, delivering a genuine reduction in backpressure that can translate to modestly improved fuel economy and reduced exhaust gas temperatures under load.
The company’s decades of diesel-specific exhaust experience translate into a system that’s widely regarded as one of the best-flowing fully-compliant options for this platform.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L Duramax diesel V8 |
| Material | Aluminized or stainless options |
| Type | Cat-back (retains DPF, SCR, EGR) |
| Install Time | 1–2 hours |
Pros
- Diesel-specific engineering expertise
- Can modestly help fuel economy and EGT under load
- Fully emissions-compliant
Cons
- Premium pricing
- Diesel-specific fitment
Price Range: $560–$760
6. Flowmaster American Thunder Cat-Back (L8T Gas V8)
⭐⭐⭐⭐ (4.3/5) — Badge: Best Value (Gas)
“The classic Flowmaster rasp at a price below premium stainless competitors.”
Flowmaster’s American Thunder series uses their signature chambered muffler design, delivering an aggressive tone at a more accessible price than full stainless systems from Borla or MagnaFlow.
The aluminized steel construction won’t match stainless longevity, but for owners prioritizing sound and budget, it’s a well-proven option with decades of history on GM trucks.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L L8T gas V8 |
| Material | Aluminized steel |
| Type | Cat-back |
| Install Time | 1–2 hours |
Pros
- Signature aggressive Flowmaster tone
- More affordable than stainless competitors
- Reliable, well-established design
Cons
- Aluminized steel less durable long-term than stainless
- Some drone reported at certain RPM ranges
Price Range: $420–$570
7. Gibson Performance Cat-Back Exhaust (L8T Gas V8)
⭐⭐⭐⭐ (4.1/5) — Badge: Best Value Stainless (Gas)
“Full stainless construction at a price point that undercuts most premium competitors.”
Gibson offers stainless steel cat-back systems at a more accessible price than Borla or MagnaFlow, making full-stainless durability available to budget-conscious L8T owners without dropping to aluminized steel construction.
The straight-through muffler design provides solid flow improvement, and Gibson’s lifetime warranty against manufacturing defects adds confidence for the price point.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L L8T gas V8 |
| Material | Stainless steel |
| Type | Cat-back |
| Install Time | 1–2 hours |
Pros
- Stainless steel at a budget-friendly price
- Lifetime warranty against defects
- Solid flow improvement
Cons
- Tone less refined than premium brands
- Fewer configuration options
Price Range: $460–$610
8. MBRP Installer Series Exhaust (Duramax Diesel)
⭐⭐⭐⭐ (4.2/5) — Badge: Best Budget Diesel Option
“Core Duramax exhaust flow improvement at a price point below MBRP’s premium stainless offerings.”
MBRP’s Installer Series uses aluminized steel construction rather than stainless, delivering the same core backpressure-reducing benefit downstream of the DPF at a more accessible price point.
This is a solid choice for Duramax owners who want a genuine flow and tone upgrade without the premium cost of full stainless construction, while remaining fully compliant with factory emissions equipment.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L Duramax diesel V8 |
| Material | Aluminized steel |
| Type | Cat-back (retains DPF, SCR, EGR) |
| Install Time | 1–2 hours |
Pros
- More affordable than stainless diesel options
- Genuine backpressure reduction
- Fully emissions-compliant
Cons
- Aluminized steel less durable long-term than stainless
- Diesel-specific fitment
Price Range: $380–$520
9. Corsa Sport Cat-Back Exhaust (L8T Gas V8)
⭐⭐⭐⭐ (4.2/5) — Badge: Best Quiet-Mode Option (Gas)
“Corsa’s Reflection Cancellation Technology genuinely reduces resonance rather than just muffling volume.”
Corsa’s proprietary muffler design uses sound-cancellation-style tuning to reduce specific resonant frequencies rather than simply adding sound-deadening material, resulting in an exhaust that’s aggressive under acceleration but noticeably quieter at cruise or while towing.
This makes it a strong pick for L8T owners who want the option of an aggressive tone on demand without a droning highway commute or long tow trip.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L L8T gas V8 |
| Material | T-304 stainless steel |
| Type | Cat-back |
| Install Time | 1–2 hours |
Pros
- Reduced highway/towing drone via resonance cancellation
- Full stainless construction
- Aggressive tone under acceleration
Cons
- Premium pricing
- Some owners want more volume at idle
Price Range: $640–$860
10. Diamond Eye 4″ Cat-Back Exhaust (Duramax Diesel)
⭐⭐⭐⭐ (4.2/5) — Badge: Best Alternative Diesel Brand
“Another established diesel exhaust manufacturer offering a fully compliant, larger-diameter system as an alternative to MBRP or aFe.”
Diamond Eye’s 4″ cat-back system gives Duramax owners another well-regarded brand option to compare when shopping for a backpressure-reducing, fully emissions-compliant exhaust upgrade.
The mandrel-bent tubing and quality clamps make for a straightforward, reliable installation, with the factory DPF and SCR systems left completely untouched.
| Spec | Detail |
|---|---|
| Engine Fitment | 6.6L Duramax diesel V8 |
| Material | Aluminized or stainless options |
| Type | Cat-back (retains DPF, SCR, EGR) |
| Install Time | 1–2 hours |
Pros
- Established, reputable diesel exhaust brand
- Fully emissions-compliant
- Available in stainless or aluminized
Cons
- Premium pricing for stainless version
- Diesel-specific fitment
Price Range: $460–$650
Buying Guide: How to Choose an Exhaust System for Your Silverado 2500/3500 HD
1. Confirm Your Engine Exhaust systems are engine-specific between the 6.6L L8T gas V8 and 6.6L Duramax turbo-diesel V8 — always match the system to your exact engine.
2. Diesel Systems Must Retain Emissions Equipment Every diesel exhaust product in this guide retains the factory DPF, SCR, and EGR system. “Delete” products that remove or bypass diesel emissions equipment are illegal for on-road use under EPA regulations — avoid any product marketed this way regardless of claimed performance benefits.
3. Material: Aluminized Steel vs. Stainless Aluminized steel is more affordable but has a shorter service life. Stainless steel costs more upfront but resists corrosion significantly longer, particularly relevant for trucks exposed to road salt or heavy towing near water.
4. Towing and Backpressure Considerations If you tow near the HD Silverado’s substantial rated capacity regularly, larger-diameter systems (MBRP, aFe Large Bore-HD, Banks Power) offer a measurable functional benefit for reduced backpressure and exhaust gas temperatures under sustained load.
5. Tone Preferences If you want an aggressive tone without highway or towing drone, look specifically for systems marketed with drone-reduction technology (like Corsa’s Reflection Cancellation or Borla’s tuned chambers).
Disclaimer: Prices and availability are accurate as of publication but may change. TruckBench earns a commission on qualifying purchases via the Amazon links above. All exhaust modifications must comply with federal and state emissions regulations; diesel emissions equipment (DPF, SCR, EGR) must not be removed or bypassed.
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