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  • MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
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MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251

Exhaust, Mufflers & Tips Muffler
Magnaflow
mag12251
Special order
August 1, 2026
$164.00
The MagnaFlow 5 X 8in. Oval Straight-Through Performance Exhaust Muffler 12251 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno-proven performance thanks to its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill. The reversible, universal 2.25/2.25in. diameter inlet/outlet Straight-Through layout allows you to install it in whatever orientation and configuration you see fit. However, professional installation is highly recommended. Muffler 12251s weight-optimized 5x8x18in. oval-shaped body features a satin finish that elevates the overall aesthetics of your current exhaust setup. 12251 is made of durable, corrosion resistant stainless steel and produced using cutting-edge CNC precision robotic manufacturing techniques, all backed by MagnaFlow's limited lifetime construction warranty. Need further assistance? Call 1-800-990-0905. Features & Benefits Delivers a Smooth, Deep Tone Mufflers Are Bi-Directional 100 Percent Stainless Steel 100% Stainless Steel Downloads & ResourcesVideo File (MP4)
MagnaFlow Muffler Mag SS 18X4X9 2.25/2.25 O/O - 11265
MagnaFlow Muffler Mag SS 18X4X9 2.25/2.25 O/O - 11265
$146.00
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/C - 12245
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/C - 12245
$139.00
MagnaFlow Muffler Mag SS 18X5X8 2.25 C/D - 12251
SKU: mag12251
Product Details

Everything You Need To Know

Review product information, shipping and returns, and price-match details before you order.

Product Info

The MagnaFlow 5 X 8in. Oval Straight-Through Performance Exhaust Muffler 12251 is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno-proven performance thanks to its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill. The reversible, universal 2.25/2.25in. diameter inlet/outlet Straight-Through layout allows you to install it in whatever orientation and configuration you see fit. However, professional installation is highly recommended. Muffler 12251s weight-optimized 5x8x18in. oval-shaped body features a satin finish that elevates the overall aesthetics of your current exhaust setup. 12251 is made of durable, corrosion resistant stainless steel and produced using cutting-edge CNC precision robotic manufacturing techniques, all backed by MagnaFlow's limited lifetime construction warranty.

Need further assistance? Call 1-800-990-0905.

Features & Benefits

  • Delivers a Smooth, Deep Tone
  • Mufflers Are Bi-Directional
  • 100 Percent Stainless Steel
  • 100% Stainless Steel

Downloads & Resources

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Shipping on new purchases

In Stock Items:
In stock items typically ship within 1-3 business days. Most items arrive within 2 business days, but there are situations where it may take up to 5 business days.

Special Order Items:
Special order and out of stock items are product-specific and lead times can vary. Please e-mail us if you are looking for an ETA / Lead Time on a specific product. Special order orders are subject to cancellation if the vendor cannot provide any ETA.

Returns Policy

To start the return process, please e-mail sales@allianceracing.com

Include the following:
Subject "Return for Order#"
Order Number
Part Number
Reason

Returns are eligible for up to 14 days from delivery of items. Accepted refunds can take up to 7-10 business days to process. All refunds are subject to a 25% restocking fee, if opened. Customer may be responsible for return shipping. If 14 days have gone by since your item was delivered, unfortunately we can’t guarantee you a refund or exchange. We reserve the right to deny any return request, based on provided information.

Alliance Racing is not responsible for ensuring part fitment. It is the responsibility of the purchaser to ensure the parts being ordered are the correct fitment for the vehicle intended. Alliance Racing will not accept any returns for incorrect fitment after product is opened.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Shipping

To return your product, mail your product to:
Alliance Racing LLC
8810 Twin Lakes Blvd
Tampa, FL 33614

In many cases, you will be responsible for shipping costs to return your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping will be deducted from your refund.

Depending on your location, the time it may take for your exchanged product to reach you may vary.

If you are shipping an item over $100, you should consider using a trackable shipping service and/or purchasing Shipping Insurance.

To initiate a price match, please e-mail sales@allianceracing.com with the product information (SKU, URL, & Part Name) and a link to the competitors product page for us to validate the price match eligibility.

Please note that there are cases when we cannot offer a price match, but we will do everything in our power to try to match it. Some manufacturers have Pricing Policies that we have to adhere to.

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