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- USA
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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
Fits 1962-70 Plymouth Belvedere Straight Through Muffler-Stainless SM12229-JHPRStreet Max, Stainless Straight Through Performance Muffler, 5. 0" x 8. 0" x 14. 0" Oval Body, Aggressive to Moderate Tone, 16 Gauge 409 Grade Stainless Steel, Satin Finish, 3. 0" Offset In, 3. 0" Center Out, Reversible, 3 Year Limited Warranty. Features: Straight Through Design (fully reversible) Improved Horsepower and Torque 409 Grade 16 Gauge Stainless Steel Construction High Heat Thermal Mesh Effective Drone Reduction Aggressive Moderate Tone
Street Max, Stainless Straight-Through Performance Muffler, 5.0" x 8.0" x 14.0" Oval Body, Aggressive to Moderate Tone, 16-Gauge 409-Grade Stainless Steel, Satin Finish, 3.0" Offset In, 3.0" Center Out, Reversible, 3 Year Limited Warranty.
Features:
- Straight-Through Design (fully reversible)
- Improved Horsepower and Torque
- 409-Grade 16-Gauge Stainless Steel Construction
- High-Heat Thermal Mesh
- Effective Drone Reduction
- Aggressive/Moderate Tone
Specs:
| Body Length (IN) | 14 |
|---|---|
| Body Type | Oval |
| Finish | High-Heat Thermal Mesh |
| Inlet Configuration | Offset |
| Inlet Diameter (IN) | 3 |
| Material | 409-Grade 16-Gauge Stainless Steel |
| Outlet Configuration | Center |
| Outlet Diameter (IN) | 3 |
| Overall Length (IN) | 20 |
| Prop 65 - Short Label | prop65_warning.jpg |
| Prop 65 (C, R or CR) | CR |
| Prop 65 Yes/No | Yes |
| Series | 5 inx8 in Oval |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1962-1970 | Plymouth | Belvedere | |
| 1965-1967 | Plymouth | Belvedere II | |
| 1973-1977 | Pontiac | LeMans | |
| 1975-1977 | Pontiac | Grand LeMans | |
| 1982-2004 | Chevrolet | S10 | |
| 1983-1994 | Chevrolet | S10 Blazer | |
| 1987-1988 | Chevrolet | R10 Suburban | |
| 1987-1988 | Chevrolet | R20 Suburban | |
| 1987-1991 | GMC | V1500 Suburban | |
| 1989-1991 | Chevrolet | R1500 Suburban | |
| 1989-1991 | Chevrolet | R2500 Suburban | |
| 2000-2014 | Chevrolet | Express 1500 | |
| 2000-2016 | Chevrolet | Express 2500 | |
| 2000-2014 | GMC | Savana 1500 | |
| 2000-2016 | GMC | Savana 2500 | |
| 2002-2006 | Chevrolet | Avalanche 1500 | |
| 2002-2005 | Ford | Explorer | |
| 2003-2016 | Chevrolet | Express 3500 | |
| 2003-2016 | GMC | Savana 3500 | |
| 2007-2013 | Chevrolet | Avalanche | |
| 2011-2019 | Dodge | Durango | |
| 2011-2022 | Ford | F-150 | |
| 2014-2018 | Chevrolet | Silverado 1500 | |
| 2014-2018 | GMC | Sierra 1500 | |
| 2015-2022 | Ford | Mustang |
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
4.9 ★★★★★
Based on 517 reviews
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Product Reviews
★★★★★ 5
Perfect applicators tool
Tool worked great. Bonds sound proofing to metal perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
Must have
These things a freaking AWESOME!
If you're doing a big sound deadner job, you need thees! The 3 different sizes are perfect for the different shapes in the floor pans. Well built, good quality and they have a nice weight to them. Just buy them and thank me later. For $15.00 you can't go wrong.
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Reviewed in the United States on March 12, 2026
★★★★★ 5
Bringing a 1976 MG Midget to the modern world!
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
I've been restoring a 1976 MG Midget barn find. I bought some Sinless liner to help make the car rattle less and feel more solid.
This product is easy to cut, easy to install, and extremely sticky. I used it to line the trunk, the interior, and even some under the hood of the old MG. The adhesive stands up to the brutal temperature of the engine bay, and when (by accident) some fuel spilled onto the foam, it didn't fall apart or turn to mush.
Thanks to Siless, the MG now feels like a modern car. The floor pans feel much more solid, the doors make a heftier thud when you close them, and the trunk no longer sounds like a percussion instrument when you touch it.
If you know what you're doing, this product will transform the feel of a car. I found that 36 sq ft was enough for my MG Midget, but for a bigger car I would want more. The pattern on the back helped me to cut perfectly measured squares and rectangles. The foam itself doesn't have a strong odor, it works super well, and has held up to several months of changing temperatures (in the Midwest US.)
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Reviewed in the United States on November 11, 2025
★★★★★ 5
Excellent Car Sound Deadening and Heat Insulation Solution
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
If you're looking for a high-quality car sound deadening and heat insulation material, then the Siless Liner 157 (4 mm) mil 36 sqft is definitely worth considering. This product is designed to offer superior noise reduction and heat insulation for your car, making your driving experience more comfortable and enjoyable.
The closed-cell foam material used in this product is of premium quality, and it effectively blocks out external noise and vibrations. This means you can enjoy a quieter and more peaceful ride, even on noisy roads. In addition, the Siless Liner 157 also provides excellent heat insulation, which can help keep your car cooler in hot weather.
One of the best things about this product is that it's very easy to install. You don't need any special tools or equipment, and the material can be easily cut to fit any shape or size. It's also very lightweight and flexible, which makes it easy to work with.
Overall, the Siless Liner 157 (4 mm) mil 36 sqft Car Sound Deadening Closed Cell Foam & Heat Insulation mat is an excellent choice for anyone looking to improve the comfort and performance of their car. It's a high-quality product that delivers on its promises, and it's definitely worth the investment.
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Reviewed in the United States on March 12, 2023
★★★★★ 4
Heavy-Duty That Works!
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
This extreme sound deadening mat performs well for reducing road noise and vibration. It feels dense and adheres securely when properly applied. Once installed, it noticeably improves interior quietness.
Overall, it’s a strong choice for more serious sound insulation projects.
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Reviewed in the United States on May 12, 2026