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MillerCAT Corp

Stainless Steel MILLERCAT 2016-2022 Prius Gen 4 Cat Shield™

Stainless Steel MILLERCAT 2016-2022 Prius Gen 4 Cat Shield™


Regular price $190.00 USD
Regular price Sale price $190.00 USD
Sale Sold out
Shipping calculated at checkout.
Choose a Security Screw Kit for your Cat Shield™


Fits all 2016-2022 Prius Liftback and Prius Prime Trims with OEM converters. Comes with Cat Shield, installation hardware, Cat Shield Protected sticker, and detailed installation guide. 

Our 304 Stainless Steel Gen 4 Cat Shield™ is our first completely drill-less shield. It uses existing mounting points so you will not have to drill into the vehicle and will not need to buy any extra parts to install it. The shield is completely flush with the underbody that it looks like it came directly from the factoryFully removable, galvanic corrosion resistant and made from the strongest, hardest material in the market.

* Strongest material in the market. Made completely out of 304 stainless steel, you can feel the strength and difference. We've tested our shields against the top of the line blades (Diablo carbide tip) and sawzalls (Milwaukee) and the blades all failed to make any progress against our shield!

Upgrade Options: MILLERCAT Custom Screw Kit. Info on screw options

REQUIRED TOOLS FOR INSTALLATION. 5/16" bit driver or 5/16" socket, 10mm socket, 12mm socket, 13mm wrench, and panel fastener removal tool or flat head screw driver. Installation Guide

Stainless vs Aluminum


Free Shipping Info

Free shipping is available to the lower 48 States. Does not include PO Boxes. Orders may take 1-2 business days to fulfilll.

Expedited Shipping Info

Customers who need their products right away may want to pay for expedited shipping. Here are a few things to consider when choosing a faster shipping method.

- Miller CAT provides the option for faster shipping but is only a pass through for any charges. We do not make any money off of this service.

- When calculating your possible receive date, please remember that shipping services do not ship on weekends or holidays and that orders received after 1:00pm PST cannot be guaranteed to ship that day.

- Due to COVID and high volume of shipments, carriers are not always able to meet their target shipping times. Please understand we have no control over shipment tracking or times after the product leaves our facilities. 

- If you live in California or the West Coast, you may not need that expedited shipping. UPS ground can reach your destination in one to two days. 

International Purchases

If you wish to make an international purchase please contact us at By default we only ship to a few international destinations. Please be aware that there may be significant fees for you (the buyer) must pay when you receive the product.

Value Added Taxes (VAT) and import duties are some of the fees that your country will impose on your purchase. We do not know what these fees are and they are solely managed and determined by your customs office.

Warranty Information

We have a 90 day manufacturers warranty against defects from the manufacturing process. This covers issues that prevent the proper installation or performance of the product. 

Cosmetic imperfections that occur either from the manufacturing or shipping process are not covered. We do not manufacture a cosmetic product or ones designed for show. Any undercar product will quickly have scratches and scuffs due to the location of the product and proximity to the road. Click here to find out more about the manufacturing process and what you might expect from your product.

We do NOT guarantee our product against theft. Cat Shields are a deterrence device that is meant to discourage theft and/or make it more difficult for thieves to steal your converter. Given the right tools, technique or time, a thief can still take your converter. However, by having a shield, you are significantly increasing your protection against theft. Similar to a car or home alarm, you are making thieves second guess themselves and consider moving onto another target. Deterrence works and we have countless customer accounts and video evidence that converter theft stopped (for those with repeated theft) or thieves looked and moved on to other vehicles. 


There is a 30 day return policy window for unused products. Please visit this link for more information.

*We do ask that customers carefully make their purchases and reduce the possibility of returns as much as possible. Help us reduce the carbon footprint of these shields as they are large and expensive to ship.

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Customer Reviews

Based on 83 reviews
Nancy Yung
2022 Prius Shield

This is my 3rd cat shield. Previously had one installed on my 2016 Prius and my 2021 Taco. I still have my original converter on each vehicle and I just keep buying the same brand because they do the job well.

Robert Dunn

Installed by my dealer thanks

Cat Shield

Very easy to install. Came 2 days after the order being placed.

Jim S
Great Quality, Fitment, and Easy Install

With no experience with other cat shields, I can say that the R & D into fitment was thorough, and the MillerCAT shield fit perfectly without any modifications required. Great selection in material and thickness, and hardware. Installation was straightforward and understandable to anyone with mechanical aptitude. I think I spent more time figuring out how to get the front lifted up. (Prius Prime sits pretty low, and my floor jack wouldn't clear the underbody plastic without first jacking up at the appropriate pinch welds on the side. Once up in the air, installation was fairly quick.
Would have liked to have:
-the standard hex head bolts that were supplied to be a security fastener of some sort.
-the shield design to allow the head of the hex head bolts to not be proud of the plane of the shield itself, for a smoother underbelly.

Also, 2 lockwashers were missing from the hardware bag.

Snug fit

- easy to install for an amateur like me.
- install time is at most 1 hour.
- applying the included vibration dampening foam removes any potential rattling.

- the splash shield needs to be disconnected to install and is fastened by 2 plastic retainer clips. it's possible for the clips to break while extracting, but it's a common occurrence. I recommend having a few spare clips available to replace should they break.
- I raised my gen 4 prius using ramps. it gave me enough clearance to crawl under there, but it was still too cramped to work comfortably (about 6 inches of clearance to work with).