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MillerCAT Corp

MILLERCAT 2004-2009 Prius Gen 2 Cat Shield™

MILLERCAT 2004-2009 Prius Gen 2 Cat Shield™

50 total reviews

Regular price $180.00 USD
Regular price Sale price $180.00 USD
Sale Sold out
Shipping calculated at checkout.
Choose a Security Screw Kit for your Cat Shield™



Fits all 2004-2009 Prius Liftback Trims with OEM converters. Comes with Cat Shield, installation hardware, tamper-proof screw kit, Cat Shield Protected sticker, and detailed installation guide.

Our Aluminum Gen 2 Cat Shield ™ is fully removable, galvanic corrosion resistant, and has no large openings for thieves to cut through (but allows you to visibly see the converter part number to pass smog). We highly recommend pairing this shield with our Deadbolt. Recently there have been a number of incidents where experienced thieves are bypassing shields in areas with vehicles with a lot of shields. Owners in CA should consider this option.

Material:  Premium Grade 5052 Aluminum | 14 Gauge

Upgrade Options: MILLERCAT Custom Screw Kit. Info on screw options. Pair this shield with our Deadbolt for the ultimate protection and peace of mind.

Stainless steel version available. Stainless vs Aluminum

REQUIRED TOOLS FOR INSTALLATION. Rivet Nut Tool with M6 Mandrel/Head, 1/4" bit driver, 10mm socket, drill, and 25/64 drill bit (no pilot bit). Installation Guide

*Professional installation recommended.

* Item may have some surface finish imperfections.

Free Shipping Info

Free shipping is available to the lower 48 States. 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 50 reviews
Kalli Harrison
Cat converter cover

Just had it installed today. Feeling safer now.

Mechanic approved, gives peace-of-mind

Had my catalytic converter stolen (for the 2nd time!) recently and just got it replaced. When I first told my mechanic I wanted to get some sort of theft prevention device installed on my 04 Prius, he told me "there's no point in wasting your money, nothing offers good enough coverage, they'll just cut it on either side of whatever you put on and they'll take the whole thing". Decided to order this shield just so I could say that at least I tried instead of just letting it be a sitting duck. After the Millercat shield was installed, I got a call from my mechanic and he said he was impressed with the amount of coverage it gave to the car's underside and he believes that it will actually be an effective deterrent. He said that he's installed some protective measures before, but this was the best that he's seen. Needless to say, that gives me great peace-of-mind. No overheating, excessive noise, or vibrations either, gave 4 out of 5 only because I haven't seen it tested against a thief yet.

Ramona Sinclair
Hopefully this will protect my Cat

Thank you, Millercat, for making this shield to protect our cats -- was told it was easy to install, even with the improved bolts. No noise or vibration that I notice. I pray it works!

Alfred Valdez

The product is great. It looks like it would of help to have designed it a little longer. I did have some trouble getting the clearance under my Prius to install had to barrow a bigger jack and had to purchase a rivet gun. So had an extra expense. Let's see if it deters thieves. I do sleep better at night with the sheild installed.

Ray Briare
So far, so good

My mechanic and I each independently researched a solution so that my catalytic converter would not be stolen a second time. We both chose this one. Purchase and installation is about 10% of replacing catalytic converter. Went on quickly, no rattles, no problems. So far, so good.