Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 6 - Jul 11
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
HELIX Ci3 W165FM-S2 + HELIX CFMK165 AUD.2 (FDM) BundleMatched speaker and vehicle specific adapter bundle. Speaker: HELIX Ci3 W165FM S2 (CI21601) Adapter: HELIX CFMK165 AUD. 2 (FDM) (CI41665) Vehicle compatibility Please check your make, model, year, sound system and speaker position before ordering. Audi A3 Typ 8Y 07 2020 today Rear (Audi Sound System) Audi A3 Typ 8Y 07 2020 today Rear (Bang & Olufsen Advanced Sound System) Audi A3 Typ 8Y 07 2020 today Rear (Standard Stereo) Audi A4 B8 Typ 8K 12 2007 08
Matched speaker and vehicle-specific adapter bundle.
- Speaker: HELIX Ci3 W165FM-S2 (CI21601)
- Adapter: HELIX CFMK165 AUD.2 (FDM) (CI41665)
Vehicle compatibility
Please check your make, model, year, sound system and speaker position before ordering.
- Audi A3 Typ 8Y 07/2020-today — Rear (Audi Sound System)
- Audi A3 Typ 8Y 07/2020-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A3 Typ 8Y 07/2020-today — Rear (Standard Stereo)
- Audi A4 B8 Typ 8K 12/2007-08/2015 — Rear (Audi Sound System)
- Audi A4 B8 Typ 8K 12/2007-08/2015 — Rear (Bang & Olufsen Advanced Sound System)
- Audi A4 B8 Typ 8K 12/2007-08/2015 — Rear (BOSE Surround Sound)
- Audi A4 B8 Typ 8K 12/2007-08/2015 — Rear (Standard Stereo)
- Audi A4 B9 Typ 8W 10/2015-today — Rear (Audi Sound System)
- Audi A4 B9 Typ 8W 10/2015-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A4 B9 Typ 8W 10/2015-today — Rear (Standard Stereo)
- Audi A5 Typ 8T 06/2007-06/2015 — Rear (Audi Sound System)
- Audi A5 Typ 8T 06/2007-06/2015 — Rear (Bang & Olufsen Advanced Sound System)
- Audi A5 Typ 8T 06/2007-06/2015 — Rear (Standard Stereo)
- Audi A5 Typ F5 07/2016-today — Rear (Audi Sound System)
- Audi A5 Typ F5 07/2016-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A5 Typ F5 07/2016-today — Rear (Standard Stereo)
- Audi A6 C7 Typ 4G 04/2011-08/2018 — Rear (Audi Sound System)
- Audi A6 C7 Typ 4G 04/2011-08/2018 — Rear (Bang & Olufsen Advanced Sound System)
- Audi A6 C7 Typ 4G 04/2011-08/2018 — Rear (BOSE Surround Sound)
- Audi A6 C9 02/2025-today — Rear (Audi Sound System)
- Audi A6 C9 02/2025-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A6 C9 02/2025-today — Rear (Standard Stereo)
- Audi A6 Typ C8 08/2018-01/2025 — Rear (Audi Sound System)
- Audi A6 Typ C8 08/2018-01/2025 — Rear (Bang & Olufsen Advanced Sound System)
- Audi A6 Typ C8 08/2018-01/2025 — Rear (Standard Stereo)
- Audi A7 C7 Typ 4G 07/2010-02/2018 — Rear (Audi Sound System)
- Audi A7 C7 Typ 4G 07/2010-02/2018 — Rear (Bang & Olufsen Advanced Sound System)
- Audi A7 C7 Typ 4G 07/2010-02/2018 — Rear (BOSE Surround Sound)
- Audi A7 Typ C8 02/2018-today — Rear (Audi Sound System)
- Audi A7 Typ C8 02/2018-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A7 Typ C8 02/2018-today — Rear (Standard Stereo)
- Audi A8 Typ D5 11/2017-today — Rear (Audi Sound System)
- Audi A8 Typ D5 11/2017-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi A8 Typ D5 11/2017-today — Rear (BOSE Surround Sound)
- Audi Q2 typ GA 08/2016-today — Rear (Audi Sound System)
- Audi Q2 typ GA 08/2016-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi Q2 typ GA 08/2016-today — Rear (Standard Stereo)
- Audi Q5 Typ 8R 11/2008-12/2016 — Rear (Audi Sound System)
- Audi Q5 Typ 8R 11/2008-12/2016 — Rear (Bang & Olufsen Advanced Sound System)
- Audi Q5 Typ 8R 11/2008-12/2016 — Rear (Standard Stereo)
- Audi Q5 Typ FY 01/2017-today — Rear (Audi Sound System)
- Audi Q5 Typ FY 01/2017-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi Q5 Typ FY 01/2017-today — Rear (Standard Stereo)
- Audi Q7 Typ 4L 09/2005-05/2015 — Rear (Audi Sound System)
- Audi Q7 Typ 4L 09/2005-05/2015 — Rear (BOSE Surround Sound)
- Audi Q7 Typ 4L 09/2005-05/2015 — Rear (Standard Stereo)
- Audi Q8 Typ 4M 06/2018-today — Rear (Audi Sound System)
- Audi Q8 Typ 4M 06/2018-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi TT Typ FV/8S 08/2014-today — Rear (Audi Sound System)
- Audi TT Typ FV/8S 08/2014-today — Rear (Bang & Olufsen Advanced Sound System)
- Audi TT Typ FV/8S 08/2014-today — Rear (Standard Stereo)
- Cupra Formentor 01/2020-today — Rear (Beats Audio Sound System)
- Cupra Formentor 01/2020-today — Rear (Standard Soundsystem)
- Cupra Leon Typ KL 02/2020-today — Rear (Beats Audio Sound System)
- Cupra Leon Typ KL 02/2020-today — Rear (Standard Soundsystem)
- Cupra Terramar 08/2024-today — Rear (Beats Audio Sound System)
- Cupra Terramar 08/2024-today — Rear (Standard Soundsystem)
- Seat Leon Typ 5F 11/2012-today — Rear (Navigation)
- Seat Leon Typ 5F 11/2012-today — Rear (Seat Sound System)
- Seat Leon Typ 5F 11/2012-today — Rear (Standard Soundsystem)
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 1336 reviews
Sort
Product Reviews
★★★★★ 4
Awesome, inexpensive alternative to name-brands!
Size: 36 sqft
Awesome. Stuck well with alcohol prep and time to let liquid flash-off. Very consistent, piece to piece. Backing peeled easily when desired. Compared to Amazon Basics, the butyl seemed a little thicker (infinitesimally) and stickier, foil was less thick than Amazon Basics. Very good value. Started with my nice car, but after completing project, sound dampened all cars in the immediate family it made such a noticeable difference in sound level and quality of music from soeakers. Recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 21, 2025
★★★★★ 5
Easy to use
Size: 36 sqft, Size: 36 sqft
Very good and easy to use, made my 88 Chevy feel better
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
★★★★★ 5
Great sound deadening material with easy installation.
Size: 36 sqft, Size: 36 sqft
This sound-deadening mat was easy to install on the roof of my Toyota FJ Cruiser. It significantly stiffened the roof and dramatically reduced the wind noise inside the vehicle caused by my roof rack and lights. I can actually carry on a conversation again without shouting while driving on the freeway.
The 36-square-foot package was enough for my application, with about three sheets left over. The tiles adhered well to the metal without any special surface preparation. I only wish I had done this sooner.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 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!
WAS THIS REVIEW HELPFUL?YesReportShare
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.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 15, 2026
recommand products
Edelbrock 4500 Carb Fuel Reg Kit
112.47
Organic Luxe Maintenance Leave In 250ml
3750.00
AuraPoint - 2 Unit Point - Large BS5899-1 First Aid Kit & Double Eyewash Station
146.99
AuraPoint - 3 Unit Point - Large BS5899-1 First Aid Kit, Double Eyewash Station & Burns Kit
115.00
Carrick Bannockburn Central Otago Sauvignon Blanc 2022
167.94