The MagnaFlow XL 4 X 9in. Oval Multi-Chamber Performance Exhaust Muffler 13266 features a straight-through, weight-optimized reversible design with a perforated stainless steel core featuring baffles and tuning gates, enabling it to deliver the powerful signature sound and dyno-proven performance that's made MagnaFlow a household name. Muffler 13266's oval-shaped, 4x9x18in. body and universal 2.5/2.5in. diameter inlet/outlet layout enables flexible installation options to match the spacing requirements of your vehicle. Professional installation is highly recommended. 13266 is produced using advanced CNC precision robotic manufacturing techniques and features durable, corrosion resistant stainless-steel construction, all backed by MagnaFlow's limited lifetime warranty.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 1988-1993 |
Chevrolet |
C1500 |
Cheyenne |
| 1988-1992 |
Chevrolet |
C1500 |
Scottsdale |
| 1988-1993 |
Chevrolet |
C1500 |
Silverado |
| 1990-1993 |
Chevrolet |
C1500 |
WT |
| 1988-1993 |
Chevrolet |
C2500 |
Cheyenne |
| 1988-1992 |
Chevrolet |
C2500 |
Scottsdale |
| 1988-1993 |
Chevrolet |
C2500 |
Silverado |
| 1988-1993 |
Chevrolet |
K1500 |
Cheyenne |
| 1988-1992 |
Chevrolet |
K1500 |
Scottsdale |
| 1988-1993 |
Chevrolet |
K1500 |
Silverado |
| 1991 |
Chevrolet |
K1500 |
Sport |
| 1990-1993 |
Chevrolet |
K1500 |
WT |
| 1988-1993 |
Chevrolet |
K2500 |
Cheyenne |
| 1988-1992 |
Chevrolet |
K2500 |
Scottsdale |
| 1988-1993 |
Chevrolet |
K2500 |
Silverado |
| 1988-1993 |
GMC |
C1500 |
Sierra |
| 1988-1993 |
GMC |
C1500 |
Sierra SLE |
| 1988-1993 |
GMC |
C1500 |
Sierra SLX |
| 1988-1993 |
GMC |
C2500 |
Sierra |
| 1988-1993 |
GMC |
C2500 |
Sierra SLE |
| 1988-1993 |
GMC |
C2500 |
Sierra SLX |
| 1988-1993 |
GMC |
K1500 |
Sierra |
| 1988-1993 |
GMC |
K1500 |
Sierra SLE |
| 1988-1993 |
GMC |
K1500 |
Sierra SLX |
| 1993 |
GMC |
K1500 |
Sierra Sport |
| 1988-1993 |
GMC |
K2500 |
Sierra |
| 1988-1993 |
GMC |
K2500 |
Sierra SLE |
| 1988-1993 |
GMC |
K2500 |
Sierra SLX |
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
The AutoHouse Advantage: Global sourcing power paired with specialized expertise. We utilize an expansive supply network of over 600,000 SKUs to deliver world-class components with an enthusiast’s precision.
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Price Match Guarantee:
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We are committed to providing the best value. If you find a lower advertised price from a verified vendor, we will match it. Shop with confidence knowing you’re getting the industry's lowest price.
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Project Incentives:
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We reward enthusiasts who trust us with their major projects. Use these tiered codes at checkout to apply instant savings to your order:
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• AH180 — $180 OFF $3000+ | • AH400 — $400 OFF $6000+
• AH630 — $630 OFF $9000+
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Fitment Guarantee:
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Avoid the headache of the wrong part. If you are unsure about compatibility, contact us first. If we verify the fitment for your vehicle via email and it doesn’t fit, we will handle the exchange at no cost to you.
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High-value performance parts deserve high-level security. We utilize fully encrypted, PCI-compliant checkout and premium, insured carriers to ensure your investment is protected from the moment you click 'Order' until it’s in your hands.
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Building something big? If you’re planning a full overhaul or need a custom quote, reach out to our team via our
Contact Page.
Precision Support: Whether you are dialing in a daily driver or sourcing components for a high-performance exotic, our team is here to ensure your project stays on track. Use the channels below for sales, technical assistance, or order updates.
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Direct Consultation:
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(828) 588-5888
Monday – Friday | 9am – 5pm EST
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To qualify for our Fitment Guarantee, please email your vehicle’s Year, Make, Model, and any existing modifications to:
support@autohousesupply.com
Our experts will review your specifications and provide written confirmation for your build.
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For tracking updates or status inquiries on existing orders, please reach out via our Contact Form. Having your order number ready will allow us to provide the most efficient update.
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Secure Shipping:
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We offer FREE Ground Shipping within the 48 contiguous United States. Most in-stock orders process within 48 hours. For your security, high-value performance parts require a signature upon delivery to ensure they reach you safely.
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Transit Protection:
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Please inspect your order immediately. Damage must be reported within 48 hours. For freight/LTL items, if you cannot inspect the contents immediately, please write "Subject to Inspection" on the delivery receipt before signing.
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Flexible Returns:
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Unused items in brand-new, original packaging can be returned within 30 days. While standard refunds incur a 25% restocking fee, we will waive this fee entirely if you choose store credit or an exchange for your next upgrade.
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Exclusions:
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To ensure every customer receives brand-new, untampered components, parts that have been installed, modified, or used are non-returnable. Custom builds, special orders, and wheel/tire packages are considered final sale.
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Need assistance? Reach out via our
Contact Form before shipping any items back so we can provide you with an RMA number.
Fitment Guarantee
Fitment guides and tools are helpful—but your car is unique! Some trims and options aren’t always listed, so if you want 100% confidence that a part will fit, our team is happy to double-check for you. We take the guesswork out of your purchase by standing behind our expertise.
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Verify Your Build:
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If this product doesn't list your specific vehicle data, simply reach out to support@autohousesupply.com. We will manually verify compatibility for you.
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Our Promise:
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When we confirm a fitment in writing and it doesn’t work for your application, we cover the return shipping and exchange it at no cost to you.
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Questions? Send us your
Year, Make, and Model via our
Contact Form and we’ll get you a definitive answer so you can buy with confidence.
