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Exhaust› Mufflers and Resonators

Magnaflow

MagnaFlow 5 X 11in. Oval Straight-Through Performance Exhaust Muffler 12578

$283.17 $186.00 Save $97.17

SKU: M001 12578

In Stock
In Stock
Ships by Jun 13
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Magnaflow 12578 is a performance exhaust muffler designed to enhance your vehicle's sound and performance. It features a straight-through, one-piece core for unrestricted flow, reducing back pressure and heat. This muffler delivers a deep, rich Magnaflow growl, ideal for V8s and large-displacement V6s.

Constructed from durable T-409 stainless steel, it offers maximum corrosion resistance. The muffler's 5x11x22-inch oval body has a satin finish and includes acoustical fiber fill around a perforated stainless steel core to minimize drone. It is reversible, allowing for custom fitment.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMagnaflow
Part NumberM001 12578

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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