What Are Dual Exhaust Cutouts?

Dual exhaust cutouts are aftermarket components that give drivers direct control over their vehicle’s exhaust flow. Unlike a permanent modification like a muffler delete, cutouts install inline with the existing exhaust system and feature a valve that can open or close. When the valve is open, exhaust gases bypass part of the restrictive system (such as the muffler or catalytic converter) and exit through a separate pipe, creating a louder, more aggressive tone. When closed, the exhaust returns to its stock, quieter path. These systems are typically activated manually (via a cable or lever) or electronically (with a switch, remote, or smartphone app). Modern electronic cutouts use a butterfly valve or a gate mechanism, operated by a vacuum actuator or electric motor.

Dual cutouts — as opposed to single cutouts — involve two separate valves, one for each exhaust bank in a V-type engine or dual exhaust setup. This configuration provides a balanced sound and a symmetrical visual upgrade, often with polished or chromed tips protruding from the rear bumper or side exit.

Benefits of Installing Dual Exhaust Cutouts

Beyond the obvious aesthetic appeal, dual cutouts offer a range of advantages that appeal to enthusiasts, daily drivers, and weekend warriors alike.

Customizable Sound Profile

Perhaps the greatest draw of dual exhaust cutouts is the ability to switch between a near-stock quiet mode and a throaty, unrestricted roar. This lets you enjoy a loud, aggressive exhaust note at the track, during a cruise, or for show – then silence the vehicle for early morning starts, residential neighborhoods, or long highway trips. The sound character depends on the exhaust layout, but typical gains include deeper bass notes, sharper crackles on deceleration, and a more pronounced snarl under throttle.

Visual Aggression and Personalization

Dual exhaust cutouts add a bold, competition-inspired look to any vehicle. Exposed cutout tips — often available in stainless steel, carbon fiber, or black powder coat — frame the rear bumper or exit from the side behind the rear wheels. This visual mod stands out, especially on cars that originally had a single hidden or modest exhaust outlet. Many cutout kits come with billet valve covers or illuminated tips, further enhancing the custom appearance.

Potential Performance Gains

When open, dual cutouts reduce exhaust backpressure, allowing the engine to expel gases more freely. This can lead to a minor increase in horsepower and torque — typically 5–15 hp on naturally aspirated engines, with larger gains on forced-induction setups. However, gains are not guaranteed and depend on the rest of the exhaust system. Track days or drag races benefit most from open cutouts, while closed operation keeps the car compliant with noise restrictions.

Versatility Across Driving Scenarios

Unlike a loud exhaust system that is always loud, dual cutouts adapt to your needs. Use closed mode for commuting, drive-throughs, or passing through noise-sensitive zones. Open up for spirited drives, car meets, or when you want to let your engine sing. This split personality makes cutouts ideal for one-car garages that serve both daily duty and weekend fun.

Types of Dual Exhaust Cutouts

Knowing the options helps you choose the right system for your vehicle and budget.

Manual Cutouts

The simplest design uses a cable-operated valve (similar to a choke cable) mounted in the cabin. Pulling the handle opens the valve; pushing it closes it. These are cost-effective, reliable, and easy to install, but require physical effort and cable routing. Manual cutouts are best for off-road or race applications where electronic complexity is unnecessary.

Electric (Motorized) Cutouts

Electric cutouts use a small motor or solenoid to actuate the valve. They are controlled by a handheld remote, a dashboard switch, or a smartphone app via Bluetooth. Electric systems offer instant response and can be integrated with custom exhaust controllers for variable openings. This is the most popular choice for street cars because of convenience and clean installation.

Vacuum-Operated Cutouts

Though less common, vacuum cutouts use engine vacuum to operate the valve. They require a vacuum source and a solenoid to control the air flow. They work reliably on engines with consistent vacuum, but may not hold a seal as well as electric units at high RPMs.

Installation Tips and Considerations

Installing dual exhaust cutouts is a moderate to advanced DIY project, but attention to detail is critical for performance, safety, and longevity.

  • Check Exhaust Layout and Clearance: Your vehicle must have a dual exhaust system (either factory or aftermarket with two separate pipes from the engine or a Y-pipe splitting into two). Measure available space for the cutout body and plumbing. Avoid locations too close to suspension components, fuel lines, or the underbody to prevent heat damage or interference.
  • Choose the Right Placement: Common locations are just after the catalytic converters (for minimal restriction), before the muffler (for maximum sound), or at the rear axle. Pre-muffler placement gives the loudest result; post-muffler (or axle-back) is softer. For dual cutouts, symmetrical placement on both sides maintains balanced exhaust flow and sound.
  • Select Durable Materials: The cutout valve, pipe sections, and tips must withstand high exhaust temperatures (up to 1200°F or more) and corrosive road salts. 304 stainless steel or T304 is the gold standard for durability. Avoid cheap mild steel parts that rust quickly. Welded or welded-with-V-band connections are preferable to slip-fit joints that can leak.
  • Sealing and Leak Prevention: When closed, the cutout valve must seal completely to prevent exhaust leaks and noise. High-quality units use precision-machined flanges and high-temp gaskets. Apply exhaust sealant sparingly to slip joints. Test the seal after installation by closing the valve and listening for any hissing or whistling.
  • Electrical Integration (for Electronic Cutouts): Route power and ground wires securely away from heat sources and moving parts. Use a relay and fuse rated for the motor’s draw. Connect the controller to a switched 12V source (like a cigarette lighter circuit) to avoid draining the battery. Some systems require a clear line-of-sight for RF remotes; mounting the receiver antenna under the car or behind a plastic bumper works best.
  • Professional Help Recommended: If you lack welding skills, exhaust fabrication experience, or feel uncomfortable working near fuel and brake lines, have the cutouts installed by a reputable muffler shop. Improper installation can lead to dangerous exhaust fumes entering the cabin, exhaust leaks, failed valves, or even fires.

Before cutting into your exhaust, check local laws. Some states and municipalities restrict exhaust modifications that exceed noise limits. While closed cutouts keep you legal, operating them open on public roads may result in fines. Some jurisdictions require emissions controls to remain functional; cutouts placed before the catalytic converters could be considered a tampering offense. Off-road and track use is generally unrestricted. Always retain the ability to close and lock the cutouts, and use discretion.

Comparison with Other Exhaust Modifications

Dual cutouts occupy a unique niche. Here’s how they stack up against common alternatives:

  • Muffler/Resonator Delete: Permanent removal of sound-dampening elements. It’s cheap and loud, but cannot be quieted. Not legal in some areas.
  • Full Cat-Back Exhaust: Replaces the entire rear section for a specific sound and modest gains. Expensive and one-tone.
  • Straight Pipe: Extreme noise and often illegal for street use. No adjustability.
  • Active Exhaust Systems (Factory): Many modern performance cars come with electronic exhaust valves. Dual cutouts offer a similar function on older or non-active vehicles at a fraction of the dealer cost.

For enthusiasts who want both a civilized daily driver and a loud weekend toy, cutouts offer the best of both worlds without a second exhaust system.

Maintenance and Troubleshooting

Dual cutouts require periodic inspection to remain reliable.

  • Lubricate moving parts: Use a high-temperature grease or anti-seize on the valve shaft annually to prevent seizing.
  • Check for leaks: Soot around the valve housing or pipes indicates a leak. Tighten flanges or replace gaskets as needed.
  • Inspect electrical connections: Corrosion on wires or the motor can cause intermittent operation. Dielectric grease on connectors helps.
  • Keep the valve clean: Carbon buildup can restrict the valve’s range of motion. Operate the cutouts open and closed weekly to bake deposits off.

Common problems include motors that stop working, remote range issues, or the valve getting stuck halfway. Most issues resolve by cleaning, lubricating, or replacing the actuator. Keep a manual override (if available) for emergency use.

Choosing the Right Dual Exhaust Cutout Kit

Not all cutouts are created equal. Consider these factors when shopping:

  • Pipe Diameter: Match your exhaust pipe diameter (typically 2.25", 2.5", or 3"). Mismatched sizes hurt flow and require reducers.
  • Valve Type: Butterfly valves are common, but gate or guillotine designs offer a better seal. Dual-motor systems (one per side) provide independent control.
  • Control System: Remote range (100+ feet), key fob style, smartphone app compatibility (Bluetooth/Wi-Fi), and manual option.
  • Sound Profile: Some cutouts incorporate Helmholtz resonators or smaller internal chambers to shape the open note. Listen to sound clips from reputable sources.
  • Brand Reputation: Stick with established aftermarket manufacturers such as Flowmaster, Borla, Dynomax, or Quick Time Performance. Read reviews from owners of your specific car model.

Conclusion

Dual exhaust cutouts offer one of the most satisfying and reversible ways to personalize your vehicle’s look and sound. With the flip of a switch, you transform from reserved to rowdy, all while maintaining daily civility and legal compliance. Whether you’re after head-turning chrome tips, a ground-shaking V8 roar, or a subtle edge over other cars at the meet, dual cutouts deliver a unique blend of form and function. Invest in quality components, install them correctly, and you’ll enjoy years of customizable exhaust character. Just remember to respect your neighbors and local noise ordinances — and enjoy the power at your fingertips.