Best 4 Inch Diesel Muffler: Compare 10 Options

#1 · Best Overall

1. Upower Diesel Muffler

• Material: Stainless Steel-Fiberglass
• Compatible with Vehicle Type: Universal
• Inlet Connection Size: 4 in
• Outlet Connection Size: 4 in

Best for: Welded stainless straight-through upgrade.

Why it ranks #1: Lists 4-inch inlet and outlet, a 7-by-24-inch body, 30-inch overall length, stainless-steel construction, and a straight-through design.

The fully welded straight-through construction is the defining feature of Upower’s 4-inch muffler, allowing exhaust to pass without a restrictive path. Its stainless-steel build and 7-inch-round, 24-inch body suit buyers planning a full-size replacement, while the reversible ends remove the need to distinguish inlet from outlet during orientation.

Both connections measure 4 inches inside diameter, and either end can serve as inlet or outlet, giving installers flexibility when positioning the 30-inch assembly. The 24-inch-long body measures 7 inches round, so those dimensions help buyers assess available space before routing the exhaust. A straight-through design aims to preserve exhaust flow, while the welded stainless-steel construction and fiberglass material are specified for durability. This is a universal-style option for a setup that accepts its listed dimensions.

Skip it if you need a supplied clamp; JY PERFORMANCE DAC187 lists two clamps with its muffler.

Choose this Upower for a diesel exhaust replacement needing 4-inch connections, reversible ends, and a welded straight-through body. Its universal listing does not replace a dimensional check: allow for the 7-inch body and 30-inch total length.

Listed on Amazon as: Upower 4" Inlet Diesel Exhaust Muffler 7" x 24" Body 30" Whole Length XS2772 – Straight Through Stainless Steel Welded On Resonator Muffler

#2 · Best Included Clamps

2. JY PERFORMANCE Diesel Muffler

• Material: Stainless Steel
• Compatible with Vehicle Type: Diesel muffler
• Inlet Connection Size: 4 in
• Outlet Connection Size: 4 in

Best for: Clamp-included stainless replacement.

Why it ranks #2: Matches the 4-inch connections and 7-by-24-inch body dimensions, measures 30 inches overall, and includes two clamps.

Two included clamps distinguish the JY PERFORMANCE muffler, giving buyers listed fastening hardware alongside its 4-inch stainless-steel exhaust body. The straight-through design and reversible inlet-outlet arrangement suit installations where flow path and orientation matter, while its polished finish offers a finished appearance on the 7-inch-round, 24-inch body.

The muffler measures 30 inches overall with a 24-inch body and matching 4-inch inner-diameter connections, helping buyers plan the routing and space needed before installation. Since the product specifies no inlet-or-outlet difference, either end can face the incoming exhaust. Stainless-steel construction and TIG-welded straight-through design support a durable flow path, while the listing says the body absorbs unwanted interior resonance. Two included clamps provide listed hardware for the installation workflow.

Skip it if you need a 7-inch-round stainless muffler with a stated one-year warranty; Upower XS2772 lists that coverage.

This JY PERFORMANCE option suits buyers who want a stainless 4-inch muffler with two clamps supplied and a straight-through layout. Plan around its 7-inch-round body and 30-inch overall length, and note the stated six-month warranty.

Listed on Amazon as: 4 Inch Inlet Diesel Muffler Exhaust with Clamp- 7" x 24" Body – 30" OAL

#3 · Longest Listed Warranty

3. Colt Exhaust Diesel Muffler

• Material: Stainless Steel
• Compatible with Vehicle Type: Car
• Inlet Connection Size: 4 in
• Outlet Connection Size: 4 in

Best for: Stainless muffler with band clamps.

Why it ranks #3: Specifies stainless steel, 4-inch inlet and outlet, 30-inch length, included band clamps, and a five-year one-time replacement warranty against manufacturing defects.

Included band clamps distinguish the COLT EXHAUST muffler, giving buyers specified fastening hardware with a stainless-steel 4-inch exhaust assembly. Its 30-inch length and flow-focused design suit replacement planning where reduced backpressure is a priority; the listing also connects improved exhaust flow with engine response and potential fuel-efficiency benefits.

The product is listed with 4-inch inlet and outlet diameters and a 30-inch length, giving buyers core measurements for checking an exhaust route. Stainless-steel construction is described as corrosion resistant, while the performance design aims to reduce backpressure and improve airflow and exhaust-gas exit speed. The listing says those changes can help engine response and fuel efficiency, rather than guaranteeing an outcome. Band clamps are included, which supplies named hardware for the installation workflow.

Skip it if you need a stated 7-inch-round body; Upower XS2772 lists that dimension.

This COLT EXHAUST muffler suits buyers seeking a stainless 4-inch performance replacement with band clamps supplied. Its 30-inch length and flow-focused claims are useful considerations, but the listing leaves body diameter unspecified.

Listed on Amazon as: Exhaust Performance Diesel Muffler Exhaust Pipe (4" Inlet and Outlet Diameter and 30" Long) | Colt Exhaust | Stainless Steel | Free Band Clamps Included | Automotive Replacement Part

#4 · Best Quiet-Tone Option

4. MBRP Quiet Tone Muffler

• Material: Alloy Steel
• Compatible with Vehicle Type: Car
• Inlet Connection Size: 4 in
• Outlet Connection Size: 4 in

Best for: Quiet-tone towing muffler.

Why it ranks #4: Offers 4-inch inlet and outlet connections and a 30-inch overall length; its quiet-tone description targets sound suppression for over-the-road towing.

Dual-core technology paired with a quiet-tone designation makes the MBRP muffler a sound-focused choice for over-the-road towing. Its description says cab noise is greatly reduced while flow is maintained, giving drivers a stated reason to consider it for long hauls; the 4-inch inlet and outlet and 30-inch length establish its key fit dimensions.

MBRP identifies a 4-inch inlet, 4-inch outlet, and 30-inch overall length, useful measurements for planning a replacement in a matching exhaust route. The round body and single center outlet define the listed configuration. Aluminized construction and dual-core technology are described as combining flow with sound suppression, while the quiet-tone description specifically points to over-the-road towing and reduced cab noise. The listing does not provide a body length, so buyers may need other measurements for close-clearance planning.

Skip it if you need a stainless-steel muffler; COLT EXHAUST DMR is listed as stainless steel.

Choose the MBRP for towing-oriented buyers who value a quiet tone, dual-core construction, and listed 4-inch connections. Its 30-inch length helps with route planning, but the unspecified body length leaves a clearance detail unresolved.

Listed on Amazon as: Muffler 4in Inlet/Outlet Quiet Tone

#5

5. DILENBLE Diesel Muffler

• Material: 304 stainless
• Compatible with Vehicle Type: Car, Truck
• Inlet Connection Size: 4 in
• Outlet Connection Size: 4 in

Best for: Turbo-diesel flow-focused option.

Why it ranks #5: Lists 4-inch inlet and outlet, a 7-by-24-inch body, straight-through flow, and 304 stainless steel, though its stated warranty is 30 days.

A straight-through path with zero exhaust restriction is DILENBLE’s central selling feature, aimed at buyers prioritizing flow in turbo-diesel applications. The muffler pairs that layout with TIG-welded 304 stainless steel, linking its flow-focused design to heat resistance and durability, while the 4-inch connections and 7-by-24-inch body define its installation footprint.

DILENBLE specifies 4-inch inlet and outlet connections, so the muffler is suited to an exhaust route using those connection sizes. Its 7-by-24-inch body gives buyers a reference for clearance planning, though the listing does not state an overall length. A straight-through path is promoted for flow, and 100% TIG-welded 304 stainless steel is specified for heat resistance and durability. The internal perforated stainless-steel core is described alongside deep tone and noise reduction, balancing flow aims with sound considerations.

Skip it if you need an explicitly stated 30-inch overall length; Upower XS2772 lists that dimension.

This DILENBLE suits turbo-diesel owners prioritizing a straight-through path, 304 stainless construction, and the listed 4-inch connections. Its body dimensions are given, but no overall length is specified, so confirm the assembly’s available space before selecting it.

Listed on Amazon as: Diesel Exhaust Muffler, 4" Inlet/Outlet, 7"x24" Body

#6

6. TECTRUC Diesel Muffler

• Material: Stainless Steel
• Compatible with Vehicle Type: Car
• Inlet Connection Size: 4 in

Best for: Fiberglass-core race-tone muffler.

Why it ranks #6: Lists 4-inch inlet and outlet, 30-inch overall length, stainless steel, and a welded straight-through design; body dimensions are less fully specified.

CRF continuous-roving fiberglass is the TECTRUC muffler’s distinctive feature, specified to maintain a deep race tone while absorbing unwanted interior resonance. Its welded, straight-through stainless-steel construction is presented to reduce backpressure and improve exhaust flow, while the 4-inch connections and 30-inch overall length offer practical dimensions for replacement planning.

The listing gives 4-inch inner-diameter inlet and outlet connections and a 30-inch overall length, helping buyers compare the assembly with their available exhaust route. Its welded straight-through design is described as avoiding flow restriction and improving exhaust velocity. CRF fiberglass technology is linked to deep tone and resonance absorption, while stainless-steel construction supplies the stated material basis. The page does not specify body length or body diameter in the supplied dimensions, so those clearance details remain unlisted.

Skip it if you need body dimensions for clearance planning; JY PERFORMANCE DAC187 lists a 24-inch body and 7-inch round profile.

Consider TECTRUC for a buyer prioritizing welded stainless construction, straight-through flow, and a fiberglass-managed race tone. The 4-inch connections and 30-inch overall length are stated, but body dimensions are not supplied.

Listed on Amazon as: 4" Inlet Diesel Exhaust Muffler,4 Inch Inlet/Outlet Resonator Muffler Straight Through Stainless Steel 30" Whole Length XS2772,Welded On Resonator

#7

7. LCGP 8-Inch Body Muffler

• Material: Stainless Steel
• Compatible with Vehicle Type: Universal Fit

Best for: Wide-body stainless resonator.

Why it ranks #7: Provides 4-inch inlet and outlet, stainless steel, and a 30-inch overall length, but its 8-inch round body differs from the more common 7-inch body.

An 8-inch-round body is the LCGP muffler’s key distinction among the listed 4-inch options, giving buyers a wider resonator profile to account for. The stainless-steel, straight-through design is presented for higher flow and a deep, throaty tone, while its 24-inch body and 30-inch overall length help map the required installation space.

This LCGP has 4-inch inner-diameter inlet and outlet connections, with no end distinction, so orientation can follow the exhaust route. Its 24-inch body measures 8 inches round and the full assembly is 30 inches long; those dimensions help identify whether the wider housing fits the available space. Stainless-steel construction is specified, and the straight-through design is said to allow higher flow and improve exhaust velocity. The listing also names a clamp, though included-component wording says housing.

Skip it if you have limited room across the muffler body; LCGP SHR407030-DOU lists a 7-inch-round body.

This LCGP fits buyers seeking stainless construction, a straight-through resonator, and a deep tone who can accommodate its wider housing. Check clearance for the 8-inch-round body as well as the 30-inch overall length.

Listed on Amazon as: LCGP 4" Exhaust Muffler&Clamp, 4'' Inlet & Outlet, 8" x 24" Body 30" Overall Length Universal Resonator, Performance Straight Through Slotting Design Welded on Exhaust Tip, Stainless Steel Mufflers

#8

8. LCGP Diesel Muffler 2-Pack

• Material: Stainless Steel

Best for: Two-muffler stainless setup.

Why it ranks #8: Lists 4-inch connections, a 7-by-24-inch body, and 30-inch overall length, but the two-muffler pack may not suit a single replacement.

The two-muffler pack is the defining feature of this LCGP listing, suiting buyers planning a paired exhaust setup or keeping a second unit for a matching replacement. Each muffler is listed with 4-inch inlet and outlet connections, a 7-inch-round body, and a straight-through stainless-steel design.

Each listed muffler has a 24-inch body and 30-inch overall length, dimensions that help plan the route and clearance for both units. The 4-inch connections have no inlet-or-outlet distinction, allowing either end to face the incoming exhaust. LCGP describes the straight-through layout as supporting higher flow and exhaust velocity, and stainless-steel construction as providing durability and rust resistance. The two-pack quantity is useful when the installation calls for a pair, rather than a single replacement.

Skip it if you need just one muffler; Upower XS2772 is listed as a single muffler.

This LCGP pack suits buyers planning a paired installation or wanting two matching units, with 4-inch connections and straight-through construction. Each body is 7 inches round and 30 inches overall, so plan space for both.

Listed on Amazon as: LCGP 4" Inlet Diesel Exhaust Muffler, 4'' Inlet & Outlet Universal Resonator, 30'' Overall Length Stainless Steel Muffler, Straight Through Design Exhaust Tip(4" Intet 4" Outlet, 2 Pack)

#9

9. JFKAI QIANG Diesel Muffler

• Material: Alloy Steel
• Compatible with Vehicle Type: Car, Truck

Best for: Truck-focused polished resonator.

Why it ranks #9: Its title gives 4-inch inlet and outlet with a 7-by-24-inch body and 30-inch length, but specifications list alloy steel rather than stainless steel.

Truck-focused positioning sets the JFKAI QIANG muffler apart, with a 4-inch straight-through resonator intended for diesel truck exhaust systems. Its polished surface gives the 7-by-24-inch body a clean finish, and the 30-inch overall length provides a concrete size reference for buyers mapping a replacement into an existing exhaust route.

The listing describes a 4-inch inlet and outlet, a 7-by-24-inch body, and 30 inches overall, specifications that help buyers assess connection size and available installation space. Its straight-through resonator design is presented for exhaust flow and sound performance in truck applications. Stainless steel is identified in the title and feature text, while the specifications also list alloy steel as the material; buyers should account for that discrepancy when material composition is decisive. The included component is the muffler.

Skip it if you require an internally consistent material specification; choose a listing that identifies one material throughout.

Consider this JFKAI QIANG muffler for a truck buyer seeking a 4-inch straight-through resonator and polished finish. Its stated dimensions support space planning, but resolve the stainless-steel versus alloy-steel description before choosing on material.

Listed on Amazon as: 4 Inch Diesel Muffler Exhaust, 4" Inlet 4" Outlet Straight Through Resonator, 7" x 24" Body 30" OAL, Stainless Steel Muffler for Truck

#10

10. Flowmaster Pro Series Muffler

• Material: Plastic
• Compatible with Vehicle Type: Truck

Best for: Aggressive-sound truck and RV use.

Why it ranks #10: The listing identifies 4-inch center inlet and outlet and diesel applications, but provides less direct dimensional and connection detail than the other options.

Flowmaster identifies this Pro Series muffler for high-horsepower applications including diesels, RVs, and trucks, making its intended use the key differentiator. The included-component description specifies 4-inch center-in and center-out connections and aggressive sound, while its fully welded 16-gauge stainless-steel case frames a durability-focused construction approach.

The 4-inch center inlet and center outlet listed in the included-component description give buyers a specific connection arrangement to compare with their exhaust routing. Flowmaster names diesels, RVs, trucks, and high-horsepower applications as intended uses, so the listing is aimed at more than a general replacement. Its race-proven design and 409 stainless-steel internal construction sit alongside a fully welded 16-gauge stainless-steel case. The listing gives product dimensions, but does not identify them as body length or connection spacing.

Skip it if you prioritize reduced cab noise for towing; MBRP M1004A is specifically described as a quiet-tone muffler.

Choose the Flowmaster for truck, RV, or diesel buyers seeking an aggressive-sound Pro Series muffler with 4-inch center connections. Its supplied dimensions are listed, but their relationship to body length and connection spacing is not detailed.

Listed on Amazon as: Flowmaster 14020100 Pro Series Muffler