Which Catalytic Converter Theft Deterrent Is Right for Your Vehicle?

ADD A CAT and CatClamp are designed to discourage catalytic converter theft, but they use two very different methods.

ADD A CAT is a vehicle-specific aluminum shield that creates a solid physical barrier beneath the catalytic converter. CatClamp is a cable-based locking system that uses clamps and aircraft-grade wire rope to secure the converter to the vehicle.

This comparison explains the differences in construction, coverage, installation, fitment, and warranty so you can choose the protection that best fits your vehicle.

Quick Comparison

Feature	ADD A CAT Shield	CatClamp
Protection style	Solid physical shield	Cable-based locking system
Construction	3/32-inch 5052 marine-grade aluminum	Clamps and aircraft-grade wire rope
Design	Vehicle-specific, one-piece design	Universal and application-specific kits
Converter coverage	Creates a barrier beneath the converter	Cable system surrounds and secures the converter
Mounting method	Bolts to existing vehicle mounting points	Clamps attach around exhaust pipes; cable routes around the vehicle frame
Drilling required	No drilling required	Generally installed without drilling
Security hardware	Proprietary security bolts	Specialized fasteners and cable system
Ventilation	Integrated ventilation louvers	Open cable design
Typical installation	Approximately 20 minutes	Installation time varies by vehicle and cable routing
Free local installation	Available in the Houston area with shield purchase	Installer availability and charges vary
Vehicle fitment	Made for supported makes, models and years	Broader universal compatibility
Warranty	One-year theft-related full-refund guarantee, subject to terms	Warranty varies by kit; the Standard kit offers a one-year money-back or product-replacement warranty after registration
Best suited for	Drivers wanting a clean, solid, vehicle-specific shield	Drivers needing a cable-style system or coverage for vehicles without a fitted shield

The Main Difference: Shield vs. Cable Lock

The most important difference is the type of barrier each product creates.

ADD A CAT: Solid Shield Protection

ADD A CAT places a solid aluminum shield between a thief and the catalytic converter. The shield is designed to reduce direct access to the converter and the exhaust-pipe cutting areas.

Each supported application is designed around the vehicle’s underbody and existing mounting locations. This provides a cleaner, more integrated appearance than a universal cable system.

CatClamp: Cable-Based Protection

CatClamp does not use a solid shield. Its system places split clamps on the exhaust pipes before and after the catalytic converter. Aircraft-grade wire rope is then routed through the clamps and attached around sections of the vehicle frame.

Even if a thief cuts the exhaust pipes, the cable system is intended to make removing the converter more difficult.

Construction and Materials

ADD A CAT

ADD A CAT shields are constructed from 3/32-inch 5052 marine-grade aluminum. This material provides a combination of strength, corrosion resistance, and manageable weight.

The one-piece shield includes louvers designed to support airflow and ventilation around the exhaust system.

CatClamp

CatClamp uses metal clamps combined with aircraft-grade wire rope. Certain CatClamp models use different materials and heavier cable configurations, so specifications depend on the selected Standard, Maxx, or heavy-duty kit.

Because it is a cable system, CatClamp leaves areas of the catalytic converter and exhaust system visible rather than covering them with a solid panel.

Vehicle-Specific Fit vs. Universal Compatibility

ADD A CAT shields are designed for specific vehicles. This allows the shield’s mounting points, coverage, shape, and ventilation to match the supported application.

Available ADD A CAT applications include selected:

• Toyota vehicles
• Lexus vehicles
• Ford trucks and SUVs
• Chevrolet trucks
• GMC trucks
• Ram trucks
• Isuzu commercial vehicles

CatClamp offers broader compatibility because its clamps and cable can be fitted to many different exhaust layouts. That can make it an option for vehicles that do not currently have a vehicle-specific shield available.

The tradeoff is that cable routing and final installation can vary considerably from one vehicle to another.

Installation Comparison

ADD A CAT Installation

ADD A CAT shields are designed to bolt directly to existing mounting locations.

Key installation features include:

• No drilling required
• One-piece construction
• Proprietary security bolts
• Security bit included in the hardware kit
• Approximately 20-minute installation
• Free installation available in the Houston area with shield purchase

CatClamp Installation

CatClamp installation requires placing clamps before and after the catalytic converter, threading the cable through the clamp assemblies, and routing the cable around secure sections of the vehicle frame.

Installation difficulty and time depend on:

• Exhaust-pipe diameter
• Catalytic converter location
• Available clearance
• Frame access
• Cable-routing options
• The specific CatClamp kit

Professional installation may be preferable when clearance is limited or the correct cable-routing points are unclear.

Which Product Provides More Physical Coverage?

ADD A CAT provides solid-panel coverage beneath the catalytic converter. It is designed to restrict direct access to the converter and create another obstacle between the thief and the exhaust system.

CatClamp surrounds and secures the converter with multiple runs of cable. It is intended to prevent quick removal, but it does not create the same type of solid visual and physical barrier as a fitted shield.

For drivers who prefer a clean, vehicle-specific underbody barrier, ADD A CAT offers the more shield-focused design.

For vehicles without an available fitted shield, CatClamp’s broader compatibility may be an advantage.

Ventilation and Heat Management

Catalytic converters generate substantial heat, making airflow an important part of any underbody protection design.

ADD A CAT incorporates ventilation louvers into the shield. These openings are designed to promote airflow while maintaining physical coverage.

CatClamp has an open cable design and does not enclose the converter with a solid panel. Air can circulate naturally around the cable system.

Security Hardware

ADD A CAT uses proprietary security bolts to discourage removal with ordinary hand tools. A matching security bit is included in every hardware kit for installation and future vehicle service.

CatClamp uses clamp assemblies, specialized fasteners, and multiple lengths of wire rope. A thief attempting to remove the converter must contend with the exhaust cuts as well as the secured cable system.

Neither product can guarantee that theft is impossible. The purpose of both systems is to increase the difficulty, noise, risk, and time involved.

Warranty Comparison

ADD A CAT offers a one-year full-refund guarantee if the catalytic converter is stolen while the properly installed shield is in place, subject to the complete warranty requirements and exclusions.

CatClamp’s warranty depends on the kit purchased. According to CatClamp, its Standard Security kit includes a one-year money-back warranty up to the product’s list price or replacement of the CatClamp product after proper warranty registration. Certain upgraded kits may have different warranty terms.

Customers should read the complete warranty conditions for either product before purchasing. A product-replacement warranty is not necessarily the same as reimbursement for a stolen catalytic converter.

Why Choose ADD A CAT?

ADD A CAT may be the better choice if you want:

• A solid barrier beneath the catalytic converter
• Vehicle-specific fitment
• 3/32-inch 5052 marine-grade aluminum
• A clean, one-piece design
• Proprietary security bolts
• No-drill installation
• Integrated ventilation louvers
• Approximately 20-minute installation
• Free installation in the Houston area
• A one-year theft-related full-refund guarantee, subject to terms

ADD A CAT also has five years of field use with no catalytic converter theft reported to ADD Automotive from a vehicle equipped with one of its properly installed shields.

When Might CatClamp Be the Better Fit?

CatClamp may be worth considering when:

• ADD A CAT does not currently make a shield for your vehicle
• You need a product with broad or universal compatibility
• Your vehicle’s underbody does not have suitable shield mounting points
• You prefer a cable-and-clamp system
• You have a commercial or specialty vehicle requiring a heavy-duty application

Our Verdict

Both products are designed to make catalytic converter theft more difficult, but they approach the problem differently.

CatClamp is a versatile cable-based locking system that can fit a wide range of vehicles. Its broader compatibility is useful for vehicles without a fitted shield option.

ADD A CAT is the stronger choice for supported vehicles when the owner wants a clean, solid, vehicle-specific barrier. Its marine-grade aluminum construction, proprietary hardware, no-drill installation, ventilation louvers, free Houston-area installation, and theft-related refund guarantee create a more complete shield-based protection package.

Frequently Asked Questions

Is CatClamp a catalytic converter shield?

CatClamp is more accurately described as a cable-based catalytic converter lock. It uses clamps and wire rope rather than a solid shield panel.

Does ADD A CAT use cables?

No. ADD A CAT uses a solid, vehicle-specific aluminum shield secured with proprietary security bolts.

Does either product guarantee that theft is impossible?

No anti-theft device can make theft impossible. Both products are deterrents designed to increase the difficulty and time required to access or remove a catalytic converter.

Does ADD A CAT require drilling?

No. ADD A CAT shields are designed to bolt to existing mounting locations on supported vehicles.

Is CatClamp universally compatible?

CatClamp offers universal and vehicle/application-specific kits, but fitment still depends on the exhaust layout, pipe diameter, clearance, and selected kit. Compatibility should be confirmed before purchasing.

Can ADD A CAT install my shield?

Yes. ADD Automotive offers free installation with the purchase of an ADD A CAT shield in the Houston, Texas area.

Which system looks cleaner after installation?

ADD A CAT’s one-piece, vehicle-specific shield generally provides a cleaner factory-style appearance. CatClamp uses visible runs of cable, with the final appearance depending on how the cable is routed.

Protect Your Catalytic Converter

Choose vehicle-specific, solid-barrier protection from ADD A CAT.

Shop ADD A CAT Catalytic Converter Shields

Need help confirming fitment? Contact ADD Automotive before ordering.

Comparison based on publicly available manufacturer information as of August 2026. Product specifications, fitment, prices, and warranty terms can change. CatClamp and ADD A CAT are trademarks of their respective owners. ADD Automotive is not affiliated with or endorsed by CatClamp.