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Description
Ceramic Cores for Catalytic Converter Parts with Metal Coating for Emissions Control Diametr 103mm 400 600cpsiCeramic Cores for Catalytic Converter Parts Gasoline Exhaust Efficiency Product Attributes 1. Product name: Ceramic catalytic core for gasoline vehicles 2. Size: diameter: 103mm, height as picture 3. Cpsi: 400 600cpsi 4. Material: ceramic 5. Product delivery includes: 1pcs ceramic catalyst + 1pcs insulation cotton NoteDue to increased emissions standards, these items are not certified for sale in California, New York, Maine and Colorado. If your
Ceramic Cores for Catalytic Converter Parts | Gasoline Exhaust Efficiency
Product Attributes
1. Product name: Ceramic catalytic core for gasoline vehicles
2. Size: diameter: 103mm, height as picture
3. Cpsi: 400/600cpsi
4. Material: ceramic
5. Product delivery includes: 1pcs ceramic catalyst + 1pcs insulation cotton
Note：Due to increased emissions standards, these items are not certified for sale in California, New York, Maine and Colorado.If your vehicle is registered in California, New York, Maine or Colorado , these items can not work on your vehicle. Please check your registration states before you buy.
Purchasing notice
1. If you need a large batch, please contact our customer service
2. Powerful merchants, support customization, need to contact us
3. Allow us to have an error of ±1mm,It will not affect normal us
4.Please replace the catalyst of the original size and do not modify it
5.Friend of modified cars, it is recommended to contact us separately, you need to provide relevant data such as modified horsepower, only accurate data can be more suitable for your products
How Catalysts Work
Core chemical equations：
1. 2CO + O₂ → 2CO₂
2. 2C₃H₆ + 9O₂ → 6CO₂ + 6H₂O
3. 2NO + 2CO → N₂ + 2CO₂
Essential conditions for efficient operation
1. Temperature requirements:
Ignition temperature: About 300°C is required to start the reaction.
The vehicle shortens the warm-up time through a close-coupled design (close to the engine).
2. Fuel quality:
Leaded fuel will cause the catalyst to "poison" and fail, and unleaded gasoline must be used.
3. Engine health:
Misfires, burning oil and other problems will accelerate the clogging or sintering of the catalyst
When do you need a catalytic converter?
-
Increased fuel consumption : The three-way catalytic converter is damaged , which
directly causes high fuel consumption and reduced power. -
The exhaust gas is not up to standard : Noise, polluting the environment, annualinspection can not pass, if it is a car with a trip computer (ECU), damage will cause the oxygensensor to fail, may lead to fuel supply failure.
-
The engine shake fault light is on : lf the failure of the three-way catalytic convertercauses the exhaust emissions to exceed the standard, the engine control system with OBD willlight up the emission fault light.
-
Decreased power : The common failure of the three-way catalytic converter is blockageand functional failure, if the blockage will cause poor exhaust and lead to insufficient power.
- Poor exhaust and odor : Acungent, smelly odor can be smelled during idle andacceleration, and exh aust gas analysis will find that the Danyang compound (NOx) seriouslyexceeds the standard, and it should be cleaned up and repaired in time.
If you don't know how to choose the size, or need other sizes, please contact us
Ready to Upgrade?
👉 Click to Order Now | 📞 Contact Sales:
How to choose a catalyst
| Model | Purchase according to the emission standard of the vehicle model to be installed (Euro3/4/5/6). The purchase selection standard can be increased, but not lowered. |
| Size recommendations | The ratio of engine displacement to catalyst liters is 1.5:1 (Note that if there is an original catalyst size, please choose the original size and do not reduce the catalyst size to save costs) |
| Function | Please select the catalyst according to the purpose of using the catalyst (to avoid purchasing errors) |
| Cpsi | 400/600cpsi，The catalytic effect of 600cpsi is higher than that of 400cpsi |
| Insulation cotton | Its main function is to improve the installation gap and heat insulation function. (Usually 5mm thickness is the best. If the catalyst diameter is smaller, you can choose thicker insulation cotton to supplement it.) |
Application scenario diagram
| Options | Product Group Links | Installation display |
|---|---|---|
| Ceramic core | Link | |
| Ceramic core + shell | Link | |
| Ceramic core + shell + caliber | Link |
Real feedback
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 1816 reviews
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Product Reviews
★★★★★ 5
Great product!
Style: 30 sqft
I can say this product makes a huge difference with road noise and is cleaner and easy to work with when applying compared to other mats that cost about the same price.
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Reviewed in the United States on February 14, 2026
★★★★★ 5
Very heavy and thick
Style: 30 sqft
I purchased mini brands of sound ending and this is by far the heaviest sound deadening I've ever ordered. I'm not installed yet but I have a good feeling that is going to work exceptionally in blocking sound. If weight is a concern for you I would recommend a lighter product however if sound quality and a quiet ride is your priority this is the one for you.
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Reviewed in the United States on March 18, 2026
★★★★★ 5
Siless Hybrid 3-in-1 - Far Exceeded my Expectations!!!
Model: SLH20025
I recently installed the Siless Hybrid 3-in-1 sound deadening mat in my vehicle, and I’m genuinely impressed. For just $80 for 25 square feet, this product delivers performance that rivals materials costing twice as much — and with far less hassle. If you're on the fence......Just buy it! You will not be disappointed.
Easy to Install: Unlike traditional sound deadening products that are stiff, sharp, and temperature-sensitive, this mat is soft, flexible, and easy to work with. I cut it cleanly with regular scissors and pressed it into tight spaces using just my fingers, so if in you don't have a roller or install tool, a good pair of scissors and your hands can get the job done. With other brands like Dynamat, the aluminum layer often leaves micro cuts on your hands and tears up your fingertips, but Siless does not due the acoustic layer being on top and above the aluminum layer that holds the butyl layer. So, it's very easy on your hands.
Even in cooler temperatures (around 50°F), I had no trouble applying it but it goes on better heated. If warm outside, I would leave the entire box out in the sun for at least 30 minutes when it's warm or heats it's very pliable and easy to mold. Make sure its where you want it because once applied it's not ever falling off. and it became even more pliable and easy to mold. No heat gun, no mess — just straightforward application.
I installed 40–50 square feet throughout the interior, covering everything except the headliner and the flooring forward of the rear seat. The difference in cabin noise is astonishing. I can turn my radio up concert loud with gut-punching bass, and from outside the car, it sounds like a factory sound system at mid volume. I was blown away by how well it contains sound — both inside out and outside in.
My exhaust is pretty aggressive and now is barely audible from inside the cabin. While driving, it almost sounds like a stock factory setup. The Siless matting actually changed the driving experience and feels refined.
If you're skeptical about sound deadening gimmicks, I get it, but this is the first product I've used and when I needed more, I went Stright to the 3 in 1 Hybrid matting and purchased it again. I love researching before buying and that's very uncommon for me to do.
Note: Proper installation is key, and it does take time and patience. But if installed correctly and in the right places, it works better previously used from paint-on sound deadening to Dynamat.
Update Nov, 2025
After using it this in 4 separate vehicles now. I feel the Siless’s 3 in 1 Hybrid has nailed it for best budget deadener that is better than dynamat extreme in performance and installation
Protip: buy a roll of 2-3” aluminum tape and tape the seams. After trimming the edges tend to very sticky between the panels. I ran a strip of aluminum tape over the seems to create a better seal and true moisture
I used it on four vehicles now and have I have not been paid to review and purchased every order myself.
3 in 1 Hybrid deadener by Siless is the best all around easy to apply sound deadner period!
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Reviewed in the United States on September 29, 2025
★★★★★ 5
Top quality
Model: SLH20025
This Siless Hybrid 3-in-1 sound deadening mat is easy to work with and feels high-quality. The butyl material is thick and pliable, making it simple to cut and fit into doors, floors, or panels.
After installation, road noise and vibrations are noticeably reduced, and it also seems to improve the overall cabin feel. No bad smell.
At 25 sq ft per roll, it’s a good value for anyone looking to dampen noise and improve car acoustics. Overall, a solid, effective option for automotive soundproofing. Used on a Fiesta ST.
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Reviewed in the United States on February 15, 2026
★★★★★ 5
Made a big improvement in cabin noise—highly recommend
Model: SLH20025
Siless Hybrid made a huge difference in reducing noise in the floor of my truck cabin. In some areas, there was basically just bare sheet metal between the inside and outside, so adding this really helped the truck feel more solid and noticeably quieter on the road.
I used Kilmat on the doors, and honestly I wish I had used Siless Hybrid there too, but it was too late by the time I realized the difference. This material is very sticky, easy to cut, and simple to apply, which made the install pretty smooth.
Just a heads-up: the tacky side gets messy and will bond to clothing really easily, so be careful during installation. Overall, I’d definitely buy it again—great product with real results.
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Reviewed in the United States on December 2, 2025
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