What Comes in the SPELAB Kit?
The advertised package includes:
- 2 trident tube / cutout assemblies
- 2 4.5-meter extension cords
- 1 remote-control kit
- 2 2.5-inch flange/clamp connections
- 1 elbow tube
- 1 instruction manual
This makes the SPELAB system more complete than a replacement-valve-only product.
Universal installation can still require additional fabrication hardware depending on the vehicle.
Designed for Dual 2.5-Inch Exhaust Systems
This kit is intended for vehicles using:
dual 2.5-inch exhaust pipes
A common setup might look like:
Left Exhaust Bank → 2.5″ Pipe → Electric Cutout
Right Exhaust Bank → 2.5″ Pipe → Electric Cutout
The remote system allows the valves to be controlled from inside the vehicle.
That makes this configuration especially relevant to:
- Muscle cars
- V8 performance cars
- Performance trucks
- Restomods
- Street/strip vehicles
- Custom dual exhaust systems
Remote-Controlled Exhaust Sound
The cutout valves allow the driver to change the exhaust path remotely.
Valves Closed
With the valves closed, exhaust stays in the conventional system.
Depending on the vehicle, that may include:
Crossover → Resonators → Mufflers → Tailpipes
This provides the quieter configuration.
Valves Open
Open the valves and exhaust can use the bypass path.
That typically results in:
- Louder exhaust
- Deeper exhaust tone
- More aggressive sound
- Reduced downstream muffler restriction
The amount of change depends heavily on where the cutouts are installed.
Adjustable Valve Opening
One useful feature of this SPELAB system is the ability to adjust the:
valve opening angle.
That can give the driver more flexibility than a basic two-position cutout.
A partially opened valve may allow some exhaust to exit through the bypass while the rest continues through the conventional muffler system.
This gives the driver more control over exhaust volume.
2.5-Inch Exhaust Compatibility
The kit is designed for:
2.5-inch exhaust systems
which is approximately:
63.5mm
This is a popular diameter for:
- Dual V8 exhausts
- Moderate-output turbo systems
- Performance street cars
- Trucks
- Restomod builds
- Custom exhaust systems
However, “universal” does not mean “fits without measuring.”
Measure Before Ordering
SPELAB specifically advises customers to verify:
- Exhaust diameter
- Available installation space
before ordering.
You should also check:
- Outside diameter
- Straight-pipe length
- Ground clearance
- Valve clearance
- Motor clearance
- Wiring path
Our How to Install Exhaust Cutout the Right Way guide covers sizing and placement in more detail.
Why Dual 2.5-Inch Cutouts?
Dual 2.5-inch exhaust systems provide substantial total flow area.
That makes them common on:
- Small-block V8s
- LS swaps
- Classic muscle cars
- Performance pickups
- Modified street cars
A dual-valve kit allows both sides of the exhaust to open together rather than bypassing only one bank.
For true dual exhaust, that is generally the more logical configuration.
Chrome-Plated Steel Butterfly Plate
SPELAB describes the valve as using a:
chrome-plated steel butterfly plate
inside a thickened valve-body section.
The butterfly plate controls exhaust flow through the bypass.
When closed, the plate seals the cutout path as much as the valve design allows.
When opened, exhaust can flow through the bypass outlet.
Valve Construction Matters
Electric exhaust valves live in a difficult environment.
They experience:
- Exhaust heat
- Condensation
- Carbon
- Vibration
- Road spray
The valve body, butterfly plate and actuator all need to tolerate repeated heat cycles.
Regular inspection is worthwhile on any electronically controlled exhaust valve.
Remote Operation From Inside the Car
The included remote-control system allows the driver to operate the valves without manually accessing the exhaust.
That means you can change exhaust sound without:
- Removing plates
- Crawling under the vehicle
- Loosening hardware
Remote operation is one of the main advantages of an electric cutout compared with old-school manual exhaust dumps.
Long Extension Wiring
The kit includes:
two 4.5-meter extension cords
which gives the installer flexibility when routing wiring from both exhaust valves toward the control system.
Longer wiring can be helpful on:
- Trucks
- Large sedans
- Long-wheelbase vehicles
- Rear-mounted exhaust installations
Do not simply leave excess cable hanging underneath the vehicle.
Secure it properly.
Keep Wiring Away From Heat and Moving Parts
Route the electrical harness away from:
- Headers
- Turbochargers
- Catalytic converters
- Exhaust tubing
- Driveshafts
- Axles
- Suspension
- Sharp sheet metal
Use proper:
- Loom
- Heat shielding
- Retainers
- Electrical connections
Exhaust valves are supposed to move.
The wiring harness should not.
Clamp and Flange Hardware
The kit includes:
two 2.5-inch flange/clamp connections
for installation.
SPELAB also recommends its butt-joint exhaust band clamps for compatible installations.
Clamp-style mounting can make service easier and may reduce the need for permanent welding.
However, actual installation depends on the exhaust layout.
Clamp vs. Weld Installation
A clamp installation can provide:
- Easier service
- Faster removal
- Less permanent modification
Welding may provide:
- Stronger permanent attachment
- Better sealing
- Cleaner custom fabrication
The best option depends on the vehicle and how the cutouts are integrated.
Professional exhaust installation is recommended where fabrication is required.
One Elbow Tube Included
The advertised kit includes:
one elbow tube.
Because this is a dual-cutout system, verify the package configuration carefully if your planned installation requires directional outlets on both sides.
Depending on the vehicle, additional tubing or a second elbow may be needed.
Do not assume every dual-exhaust layout can be completed using only the included hardware.
Check Exhaust Outlet Direction
An open cutout releases extremely hot exhaust underneath the vehicle.
The outlet should not point directly at:
- Floorpan
- Fuel tank
- Brake lines
- Fuel lines
- Wiring
- Plastic panels
- Rubber bushings
Proper outlet orientation helps protect nearby components.
Professional Installation Is Recommended
SPELAB recommends professional installation.
That is reasonable because exhaust-cutout installation may require:
- Cutting
- Welding
- Clamping
- Electrical work
- Underbody clearance checks
- Heat-management planning
A poorly positioned cutout can create:
- Exhaust leaks
- Ground-clearance problems
- Wiring damage
- Heat damage
Mock Up the System First
Before permanently installing the kit:
- Measure the exhaust.
- Select both cutout locations.
- Position the valves.
- Check actuator clearance.
- Check outlet direction.
- Check ground clearance.
- Route the wiring temporarily.
- Test valve operation.
- Tack or clamp the hardware.
- Recheck everything.
Then complete the installation.
Can SPELAB Dual Cutouts Improve Performance?
Possibly, but there is no guaranteed horsepower gain.
Opening the cutouts may reduce downstream exhaust restriction if the normal mufflers or tailpipes are restrictive.
Potential performance differences depend on:
- Engine airflow
- Headers
- Catalytic converters
- Exhaust diameter
- Muffler design
- Engine tuning
The seller’s claim that the system improves combustion efficiency should be treated cautiously.
An exhaust cutout changes downstream exhaust restriction.
It does not directly “improve combustion” in a universal or guaranteed way.
The Real Performance Benefit
The most defensible benefit is:
reduced downstream restriction when the cutouts are open.
That can be useful on some higher-output combinations.
However, the effect depends on the existing exhaust.
A well-designed performance exhaust may already flow enough that opening the cutouts produces little measurable power.
In many applications, the biggest difference will simply be sound.
V8 and Muscle-Car Applications
Dual 2.5-inch electric cutouts are a natural fit for many:
- Mustangs
- Camaros
- Corvettes
- Challengers
- Chargers
- Classic muscle cars
- LS-swapped vehicles
- Performance trucks
On a true dual exhaust, both valves can be positioned symmetrically.
That helps maintain balanced exhaust routing.
X-Pipe and H-Pipe Systems
Dual electric cutouts can work with either:
- X-pipe exhaust
- H-pipe exhaust
Valve placement depends on the specific layout.
Our X Pipe vs H Pipe: Which Sounds Better? guide explains the difference between these two common dual-exhaust crossover designs.
Turbocharged Applications
Dual 2.5-inch exhaust can also appear on certain turbocharged or twin-turbo builds.
Potential advantages of opening the cutouts depend on:
- Turbocharger size
- Downpipe design
- Catalytic converter restriction
- Muffler restriction
- Exhaust diameter
- Boost pressure
- Calibration
The system should complement a properly sized exhaust rather than compensate for poor exhaust design.
Cat-Back Exhaust Integration
The SPELAB cutouts can be integrated into a custom cat-back system.
With the valves closed:
normal muffled exhaust
With the valves partially open:
increased exhaust volume
With the valves fully open:
maximum bypass
For more background on system layout, see Catback Exhaust vs Axleback: Which Wins?.
Test Both Valves Before Final Installation
Before welding everything permanently, test the electrical system.
Confirm that both valves:
- Open
- Close
- Move smoothly
- Respond to the remote
- Hold the selected position
If one valve moves differently from the other, troubleshoot it before final fabrication.
Inspect for Exhaust Leaks
After installation, test with the valves closed.
Look and listen for:
- Ticking
- Soot
- Exhaust odor
- Clamp leakage
- Flange leakage
Then open the valves and confirm that the outlets are safely positioned.
Recheck everything after several heat cycles.
12-Month Advertised Warranty
SPELAB advertises a:
12-month warranty
on the electric exhaust cutout kit.
The seller specifically identifies quick-wear components including:
- Motor
- Remote control
- Control box
as covered components according to the product description.
Always verify the current warranty terms before purchasing.
Warranty policies can change.
Street-Legal Considerations
Electric exhaust cutouts may be restricted on public roads.
Potential issues include:
- Excessive exhaust noise
- Muffler requirements
- Exhaust-bypass laws
- Emissions regulations
California owners should be especially careful.
For additional background, read our Is My Exhaust Legal? guide and verify current local laws.
Do Not Bypass Required Emissions Equipment
Do not install or operate the cutouts in a way that unlawfully bypasses required:
- Catalytic converters
- Oxygen sensors
- Emissions-control hardware
For street use, preserve all legally required emissions equipment.
Who Should Buy the SPELAB 2.5-Inch Dual Cutout Kit?
This kit makes the most sense for vehicles with:
dual 2.5-inch exhaust tubing
where both exhaust banks need remotely controlled cutouts.
Good potential applications include:
- Muscle cars
- Performance trucks
- LS swaps
- Restomods
- Street/strip cars
- Custom dual-exhaust systems
It is particularly useful for owners who want remotely adjustable exhaust sound without permanently committing to an always-loud exhaust.
Why Buy the SPELAB Dual Electric Exhaust Cutout?
Key features include:
- Dual 2.5-inch cutout valves
- Remote-controlled operation
- Adjustable valve opening
- Two 4.5-meter extension cords
- Two 2.5-inch flange/clamp connections
- Chrome-plated steel butterfly plates
- Thickened valve-body construction
- Elbow tube included
- Instruction manual included
- Universal dual-exhaust fitment
- Advertised 12-month warranty
For a true dual 2.5-inch performance exhaust, the SPELAB system provides a practical way to switch between a quieter conventional exhaust path and a much more aggressive bypass configuration from inside the vehicle.
Specifications at a Glance
Brand: SPELAB
Product: Dual Electric Exhaust Cutout Valve Kit
Pipe Size: 2.5 inches
Approximate Metric Size: 63.5mm
Cutout Assemblies: 2
Control: Remote
Valve Position: Adjustable
Extension Cords: 2 × 4.5m
Connections: 2 × 2.5-inch flange/clamp
Elbow Tube: 1
Instruction Manual: Included
Butterfly Plate: Chrome-plated steel
Fitment: Universal/custom dual exhaust
Advertised Warranty: 12 months
Always verify pipe diameter, installation clearance, outlet routing and current package contents before ordering.
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