What kind of sound can I expect from this Magnaflow muffler?

This muffler is designed with a straight-through core to produce a smooth, deep exhaust tone. It's intended to enhance the sound of your vehicle's exhaust system.

Is this muffler directional?

No, this muffler is bi-directional. This means you can install it in either direction, offering flexibility in how it's integrated into your exhaust system.

What are the dimensions of the muffler body?

The muffler body has an oval shape measuring 4 inches by 18 inches. The inlet and outlet pipes are both 3 inches in diameter and are centrally located.

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Specifications

Brand: Magnaflow
Part #: 11249
UPC: 841380000576

MagnaFlow Muffler Mag SS 18X4X9 3/3 C/C

Name: MagnaFlow Muffler Mag SS 18X4X9 3/3 C/C
Brand: Magnaflow
SKU: magnaflow-magnaflow-muffler-mag-ss-18x4x9-3-3-c-c-t14-241323
Price: 158.53 USD
Availability: BackOrder

$158.53

On Backorder — Expected to ship by Jul 5, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

MagnaFlow Muffler Mag SS 18X4X9 3/3 C/C. Straight-through design for a smooth, deep tone.

Key Features

Fits Magnaflow Muffler Mag SS 11249.
Features a straight-through perforated stainless steel core for improved exhaust flow.
Produces a smooth, deep exhaust tone.
The muffler body measures 4 inches by 18 inches, with a 3-inch center inlet and outlet.
Constructed from 100 percent stainless steel for corrosion resistance.
The universal design is bi-directional, allowing for flexible installation.

This is a universal muffler and is not vehicle-specific. Professional installation is recommended to ensure proper fitment and integration with your existing exhaust system.

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About this part

Product Details

Magnaflow is well-known for making exhaust components that sound great and perform well. This 11249 muffler is a prime example, built with their signature straight-through design to give your vehicle a healthy, deep exhaust note. It's designed to improve exhaust flow compared to stock mufflers, which can help your engine breathe a little easier.

This muffler features a 4 by 18 inch oval body with a 3-inch diameter inlet and outlet, both located in the center. The straight-through perforated stainless steel core is wrapped in mesh and acoustic fill, all housed in durable, corrosion-resistant stainless steel. Its universal, bi-directional design means you can install it in various orientations, though professional installation is recommended to ensure it’s set up correctly for your specific exhaust system. The satin finish also adds a clean look to your undercarriage.