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Prevent Catalytic Converter Theft

Trust CatStrap: 10 Years, 100,000+ Vehicles, 99.75% Success in Preventing Converter Theft.

Universal fit to protect any vehicle.

View Installation and Product Selection Guide

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Customer Approved: Hear Why CatStrap is the #1 Choice

"The CatStrap would deter me as a thief. Even with proper tools, this one is very difficult, if not almost impossible, to get through. It's an eye catcher. If you're a thief sliding under the car, it's going to make you wonder what it is."

- Chris Pappas (Service Manager) - 2022

Putting the Brakes on Catalytic Converter Theft



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CatStrap - The core physical protection: our patented Catstrap shield is a barrier that prevents cutting and theft.


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CatEye Alarm Add-On - A sonic deterrent that blasts painful sound to force thieves away from your vehicle.



DyeDefender Add-On - Its intimidating appearance gets thieves to just go away, and if cut, it sprays a mist of  blue staining dye to help identify thieves. (*organic composition, harmless, but difficult to remove from skin and clothing)



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Catalytic Converter Shield
  • UNRIVALED SECURITY: Patented steel-layer movement frustrates even the most powerful cutting tools. Remains 90%+ Intact after 3min of Continuous Cutting.

  • HEAVY DUTY: Ultra-hardened steel destroys saw blades, 5X harder than stainless steel!

  • THWARTS WOULD-BE THIEVES: Turns a 60-second job into an exhausting struggle guaranteed to fail.​

  • VISIBLE WARNING: Bright safety orange strip screams “Don’t even try it!”

  • UNIVERSAL FIT: Built-in adhesive and clamps allow quick, simple install on any vehicle.

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Protected by our Warranty Guarantee 


The CatStrap mounts onto your exhaust to protect the entire length of the converter and pipe using:

  1. Standard exhaust clamps; 

  2. Heat-activated adhesive bond; and

  3. Stainless steel ties. 

Between all three attachment mechanisms the strap cannot be removed, it must be cut. 

Smart Sensor activates 130 dB Siren to Keep Thieves Out from Under your Vehicle

      SONIC Barrier :                    Alarm

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  • Ear-Piercing 130 dB Noise Drives Thieves Out Due to Immediate Pain Level Under the Vehicle

  • Infrared Smart Sensor Detects Human Activity Under the Vehicle Before Cutting is Possible

  • Automatically shuts off when the threat is gone

  • Compliments the Catstrap with an Alarm Barrier at the Threshold of Human Pain to Deter Converter Theft

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The combination of the Catstrap physical barrier and ear-piercing noise of the Cateye alarm drives thieves out before they can cut.

*99% success rate over 10 years and 50,000+ installations

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See results from a representative cutting test:



The Physical Barrier

The CatStrap™ is encased in a high-temperature strap that runs down the length of your vehicle's exhaust and converter. Features a heat-activated adhesive strip (black-side) that creates a tight bond to the exhaust system to prevent removal. In addition, exhaust clamps are used to ensure a tight bond and provide additional attachment strength. In most cases the mere sight of the Catstrap, with its Bright Orange surface and the yellow warning label results in the best possible result, they "Just Go Away".  


Otherwise, when a thief armed with a battery operated saw attempts to remove your catalytic converter, the Catstrap converts what is normally a 45-60 second theft into an extremely difficult-to-cut operation requiring multiple blades. When installed according to instructions, the thief must successfully cut through the strap not once, but twice, with 3 layers of dissimilar metals. Better bring multiple blades, because one won't last!     


Now in a

 Neon Orange Color





The thief is equipped with a steel cutting blade designed to cut thin wall metal like exhaust pipe tubing. This type of blade is constructed with very small teeth, designed to cut thin pieces of metal and effectively dispose of them. While such a blade can cut through normal steel, the same blade is useless when faced with cutting through three stacked layers of ultra-hardened strip steel which exceeds the hardness of the blade. The teeth of the blade begin to dull within 60sec of cutting. In addition, the blade can't grip the steel layers properly because they move independently, slapping down on one another, and cause the blade to recoil. This makes it difficult to focus the cutting area. Our proprietary strip steel is designed for maximum cutting resistance (55 Rockwell-C hardness: 5X harder than 304 Stainless Steel). The strip steel is as harder than the saw blade, causing the blade to overheat and dull.

Once dulled,  the blade becomes useless, requiring multiple blades and large amounts of time.  The thief leaves without your catalytic converter in hand - saving you thousands!


The Physical Barrier

The Physical Barrier

The Physical Barrier

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Control Box & Siren


in the engine compartment

Catalytic Converter lock

Motion Sensor


under the car, on the rear of the firewall,


from front to back

Catalytic Converter lock



The Sonic Barrier Alarm

The Cateye is an intelligent, SMART controller that senses human motion under your vehicle. It activates a 130dB computer-generated multi-pitch siren and then automatically deactivates when they leave.  While it draws attention like a traditional alarm, its additional purpose is to turn the confined space beneath your vehicle into a painful echo-chamber by intensifying the sound levels - forcing the thief out before damage can be done.

New Automatic Option:

Automatically Turns itself On and Off

 De-Arms when engine ON, Re-Arms when engine OFF,

(no need to manually activate)

The Cateye works by using a specialized motion sensor that detects motion under your car. The Cateye is programmed to require 5-15 seconds of "sustained, purposeful movement" to avoid false alarms (e.g., small animals and random debris). It verifies the threat and only then does it activate the alarm. It can "see" from 1 to 20 feet, and has a 140 degree field of view, so it covers the entire area under your car. (Great for protecting your gas tank too.)   And it's easy to install. Just attach leads to the battery.  No wiring work required that can impact your vehicle's electric system.  When activated, it requires virtually no energy - no worries about draining your battery - even after months of no activity.


What's more, the Cateye only activates as long as it senses motion under your car, then automatically turns itself off 10 seconds after the movement is no long detected - no worries of an alarm going on all night.   

The Cateye automatically turns on and off when engine turns off and on  by sensing voltage at your battery.  When the engine is running, voltage high, when engine off, voltage is low.  It includes a remote control fob so that you can disable it.... like when you need to go in for service, oil change.   Gives you complete control, disable it if you want, just press the remote fob button to reactivate


When complimented with the Catstrap, which lengthens what is normally a 45 second operation into an extremely time consuming effort, there is no possible way a human body can endure the siren long enough to complet.e the task of removing your catalytic converter.   

  • Automatically Activates when engine turns off

  • Extra loud, multi-pitch 130 dB Sound Barrier

  • Easy to Install - all wireless

  • No battery drain

  • "Sees" between 1-20 feet in all directions

  • Guards against False Alarms

  • Automatic Turn Off when threat leaves

  • Activate up to 100 meters away

  • Complements the Catstrap

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Includes Free US Shipping and Money-Back Guarantee

Additional shipping charges for International Orders

6700 Cemetery Rd
Whitehouse, OH 43571 USA


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