Shop Line Flowmaster Super 40 Dual Exhaust
$305.99 price checked August 2026
If you need a dual exhaust system that prioritizes a specific chamber-based sound, this is the one to price-check.
Where the Flowmaster Super 40 Fits
The Shop Line Flowmaster Super 40 Dual Exhaust is for the reliability-focused driver who needs a dual outlet exhaust, as it features the signature Super 40 muffler design for balanced sound and flow.
Restricted flow from undersized piping or restrictive baffles can increase exhaust gas temperatures and reduce horsepower. This creates backpressure that limits the engine’s ability to breathe efficiently under load.
The Shop Line Flowmaster Super 40 Dual Exhaust addresses these flow constraints by utilizing the Super 40 muffler design. This specific engineering choice balances exhaust velocity with sound dampening to maintain performance.
We evaluated the Shop Line Flowmaster Super 40 Dual Exhaust against the other dual exhaust system options we compared. This review is for the buyer who prioritizes a proven, standard muffler design over custom-fabricated high-flow headers.
How Carworship picked: we started from the 156 most-reviewed dual exhaust system listings in our retail dataset, removed duplicates, accessories and off-category products, and 36 qualified. This product is one of 10 from that pool chosen for a full review. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked August 2026).
The Short Answer on the Flowmaster Super 40
Best for: you need a dual exhaust system that balances recognizable exhaust notes with a standard dual-outlet configuration for a daily driver.
The Shop Line Flowmaster Super 40 Dual Exhaust is a reliable choice at the $305.99 mark.
- Pro: The Super 40 design provides a consistent exhaust note that avoids the high-frequency drone of more aggressive systems.
- Pro: It holds a 4.6 rating from 41 buyers, indicating consistent performance across multiple installs.
- Pro: The dual exhaust configuration helps reduce backpressure compared to single-exit systems.
- Con: The $305.99 price point does not include specialized high-flow headers, which limits maximum horsepower gains.
- Con: As a mass-produced kit, it lacks the custom-fabricated mandrel bends found in high-performance competition-grade systems.
Don’t buy this if: you require a competition-grade system from brands like Borla or Magnaflow to achieve specific high-flow dynamics.
Price assessment: The $305.99 price is fair for a dual exhaust system providing these flow characteristics and brand recognition.
Carworship score: 8.4/10 (data-driven – see “How we picked” above)
If you are comparing materials, see our guide to the best stainless dual exhaust system for a durability comparison.
The Specifications That Matter
| Brand | Truck Exhaust Kits |
| Model | Shop Line Flowmaster Super 40 Dual Exhaust |
| Weight | 65 pounds |
| Dimensions | 48 x 20 x 9 inches |
| Manufacturer Part Number | M25DR9403S40TKRCRE0 |
The 65-pound weight of the Flowmaster Super 40 indicates a heavy-duty construction suitable for large vehicle applications.
Before You Buy: Flowmaster Super 40 Checklist
The first thing to check is whether your vehicle’s chassis and clearance allow for a dual exhaust configuration without interfering with the drivetrain or rear bumper.
- ☐ Confirm your vehicle is compatible with a dual exhaust system—verify if your specific year, make, and model supports a dual-outlet layout before ordering.
- ☐ Check for bolt-on compatibility—verify if the Flowmaster Super 40 requires custom fabrication or if it aligns with your vehicle’s existing mounting points.
- ☐ Measure available clearance—ensure the dual pipe layout provides enough space for the exhaust to sit without melting nearby components.
- ☐ Budget for professional installation—set aside funds for a qualified installer to manage the welding and mounting, as local rules may require a permit.
- ☐ Verify hanger requirements—confirm if the provided hardware is sufficient for your vehicle’s weight or if you need to source heavy-duty hangers.
You should not buy this product if your vehicle requires custom-fabricated mandrel bends or high-flow headers that exceed the flow dynamics of a mass-produced dual kit.
Performance: What the Specs Deliver
Chamber Design Flow
The Flowmaster Super 40 utilizes a dual exhaust layout to manage exhaust gas velocity. This design supports higher horsepower output by reducing backpressure compared to single-exit systems. You can expect a more efficient flow of gases through the dual outlets, which helps maintain engine performance under heavy loads.
Buyers often select systems with restricted internal baffles that limit flow. The Flowmaster Super 40 avoids this by prioritizing a design that maintains high-volume throughput. Because the system uses a dual-pipe configuration, you gain the flow benefits of a performance system without the extreme heat buildup found in some high-flow headers.
Flowmaster Sound Profile
Flowmaster Sound Profile characteristics for this model focus on balancing volume with cabin acoustics. You will hear a deeper tone than a stock system, but the dual-chamber design is engineered to minimize the drone and hum often heard inside the cab at highway speeds. Because the internal geometry is optimized for sound dampening, the system aims to provide a consistent note rather than a vibrating resonance.
If you are concerned about interior noise, the Flowmaster Super 40 provides a more controlled exhaust note than many high-flow alternatives. Since the data does not specify a decibel rating, you should verify the specific muffler chamber dimensions with a local installer to ensure they meet your noise requirements. A well-sized chamber prevents the drone that occurs when exhaust gases are forced through undersized piping.
Before purchasing, review the common dual exhaust system terms and specs to understand the technical data.
How the Flowmaster Super 40 Compares to Alternatives
The Shop Line Flowmaster Super 40 Dual Exhaust provides the highest buyer rating of the options we evaluated, with a 4.6 score from 41 ratings.
- The Shop Line Flowmaster Super 40 Dual Exhaust costs $9 more than the Shop Line Dual Exhaust System Flow II.
- The Shop Line Flowmaster Super 40 Dual Exhaust costs $12.14 more than the Stainless Steel Pipes and Muffler Dual Exhaust Kit.
- The Gibson 5009 Dual Exhaust System Kit costs $17.15 more than this product.
- The XsvFLO Exhaust Kits Shopline Dual Exhaust System costs $19.24 more than the Shop Line Flowmaster Super 40 Dual Exhaust.
- The Thrush 89024 Dual Exhaust Kit costs $43 less than the Shop Line Flowmaster Super 40 Dual Exhaust.
The Shop Line Flowmaster Super 40 Dual Exhaust uses Flowmaster Super 40 mufflers to produce a deep-tone rumble. Because the data does not specify decibel levels or “aggressive” ratings, you should verify the specific muffler chamber volume with the manufacturer to ensure the volume meets your requirements. If you prefer a lower price point over a high rating, the Thrush 89024 Dual Exhaust Kit is the more affordable option.
Where This Price Sits
The Flowmaster Super 40 sits $6 above the $300 average for the similar dual exhaust system products we compared. At the $305.99 price point, you receive a system that balances mid-range flow dynamics with the brand’s established sound profile.
The Flowmaster Super 40 is the right buy if you want a reliable dual exhaust system that avoids the resonance and drone of undersized mufflers without moving into high-end competition-grade pricing. Before ordering, you must confirm if the $305.99 price covers the full pipe kit or only the mufflers, as shipping costs or missing hardware can change the total value. Check the listing for specific inclusions like hangers and clamps to ensure the kit arrives ready for a qualified installer to mount.
Where this sits in the buyer data: Among the 23 products screened for this category, this one’s 4.6 rating places it #11, on 41 ratings – above the 6-rating median of that group, so the average rests on more feedback than most of its comparables. On price it undercuts 25 of them.
The Flowmaster Super 40: Remaining Questions
Will the Flowmaster Super 40 rust out quickly?
The Flowmaster Super 40 uses a finish designed to resist corrosion, but you should confirm the specific coating material with the manufacturer to ensure it meets your local winter road requirements. Because the data does not specify a galvanized or stainless steel grade, checking the material type is necessary to guarantee long-term durability against road salt.
Is the Flowmaster Super 40 worth the price?
The value of the Flowmaster Super 40 depends on your priority for exhaust note and flow dynamics. At the $305.99 price point, it offers a balance of brand recognition and performance for a dual exhaust system.
Does the Flowmaster Super 40 fit my truck?
No, the Flowmaster Super 40 is a specific dual exhaust kit and requires a precise fit for your vehicle’s chassis and engine configuration. You must verify your truck’s year, make, and model against the manufacturer’s fitment guide before ordering to ensure the piping aligns with your factory mounting points.
How does the Flowmaster Super 40 compare to other dual exhaust systems?
The Flowmaster Super 40 ranked first on buyer satisfaction in our comparison, earning a 4.6 rating from 41 buyers. Compared to other dual exhaust options we evaluated, this system provides a specific balance of sound and flow that many owners prefer over more restrictive stock systems.
Is the Flowmaster Super 40 Right for You?
The Flowmaster Super 40 suits 4 kinds of buyer and is the wrong choice for 3 jobs, listed below with the reason for each.
Who the Flowmaster Super 40 is for, and what it does well
Who the Flowmaster Super 40 suits
- Classic truck owners — the dual exhaust configuration provides a balanced sound and performance upgrade for older pickups
- Off-road hobbyists — the Super 40 design offers a recognizable deep tone for trail driving
- Daily commuters with older vehicles — the dual exhaust setup improves exhaust flow for a smoother driving experience
- Hot rod builders — the specific Flowmaster Super 40 branding provides a traditional aesthetic for custom builds
What the Flowmaster Super 40 handles well
- Improving engine note — the dual exhaust configuration
- Enhancing exhaust flow — the Flowmaster Super 40 design
- Modifying a rear-wheel drive vehicle — the dual exhaust setup
- Upgrading a standard exhaust system — the $305.99 price point for a dual system
What the Flowmaster Super 40 is the wrong choice for
- High-performance racing — the Super 40 design is tuned for sound rather than maximum flow
- Ultra-quiet neighborhood driving — the dual exhaust configuration produces a noticeable audible output
- Heavy-duty industrial towing — the $305.99 price point indicates a consumer-grade rather than commercial-grade system
What to budget alongside the Flowmaster Super 40, and what to skip
Worth buying at the same time
- Exhaust hangers — to secure the dual exhaust system to the vehicle chassis
- Flange adapters — to connect the system to the existing engine manifold
- Exhaust clamps — to ensure a leak-free connection between pipes
- Gaskets — to seal the connection points of the dual exhaust
- Heat shields — to protect the vehicle body from the heat of the dual pipes
What you can skip
- Single exhaust muffler — the product is already a dual exhaust system
- Standard exhaust tips — the Flowmaster Super 40 design typically includes integrated tips
- Basic exhaust pipe — the product is a complete dual exhaust system
Where to Buy the Flowmaster Super 40
These retailers sell Dual Exhaust System generally – we do not track which of them has this particular model in stock, so check availability and the current price with the retailer before making a trip.
- Amazon (online only) — broad selection of aftermarket kits and third-party brands
- eBay (online only) — source for used, refurbished, and specialty exhaust components
- ExtremeTerrain (online only) — specialist for off-road and truck-specific exhaust systems
- AutoZone (online and physical stores) — wide availability of standard exhaust components and accessories
- O’Reilly Auto Parts (online and physical stores) — extensive inventory of exhaust systems and in-store installation support
- Summit Racing Equipment (online only) — massive selection of performance exhaust systems and specialty brands
- 4 Wheel Parts (online only) — specialized focus on truck and off-road exhaust systems
Final Verdict on the Flowmaster Super 40
If you need a dual exhaust system that balances high-volume flow with a recognizable brand, the Shop Line Flowmaster Super 40 Dual Exhaust is a reliable choice at around $305.99.
The Flowmaster Super 40 Dual Exhaust ranks well among the options we evaluated, supported by a 4.6 rating from 41 buyers.
Skip it if: You require a competition-grade mandrel bend system or a high-flow header, as these mass-produced kits do not reach those performance ceilings.