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Exhaust› Catalytic Converters

Magnaflow

MagnaFlow Conv Univ 2in Inlet/Outlet Ctr/Ctr Round 9in Body L x 5.125in W x 13in Overall L 49 State

$220.50 $180.41 Save $40.09

SKU: M001 51204

In Stock
In Stock
Ships by Nov 5
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The MagnaFlow 51204 is a universal catalytic converter designed for custom exhaust applications. It features a 3-way catalytic process, a durable stainless steel construction, and a ceramic honeycomb substrate for efficient exhaust flow. This converter has 2.00-inch inlet and outlet diameters with slip-fit attachments. It is sold individually and includes a heat shield for added protection.
Show original supplier description

Part #: 51204

Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Universal Catalytic Converter 51204. The Universal design allows the part to fit a wide array of vehicles, and the stainless steel construction of this catalytic converter is highly resistant to corrosion. The single laser fusion welds greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with Federal/EPA Emission systems.

Features:

  • Your trusted source for EPA-compliant catalytic converters, providing assurance of genuine compliance while delivering quality that will last
  • Expertly formulated catalyst blend maximizes efficiency, ensuring optimal emissions control to keep your check engine light off
  • High strength 16 gauge 409 stainless steel tubing for exceptional corrosion resistance and maximum service life
  • Compact, lightweight construction enables installation in confined areas, welding is required
  • Durable 308 stainless steel MIG welds

Magnaflow OEM Grade Universal Catalytic Converter-2.00in.

Vehicle Symptoms
  • Check engine light on for catalyst efficiency
  • Failed emissions test
  • Rattling noise from under the car
  • Rotten egg smell from exhaust
  • Decreased fuel economy
Diagnostic Codes
  • P0420 – Cat Sys Efficiency Below Threshold (B1)
  • P0430 – Cat Sys Efficiency Below Threshold (B2)
Relevant Conversations
  • P0420 code fix catalytic converter replacement
  • Magnaflow 51204 universal catalytic converter review
  • How to install a universal catalytic converter
  • Catalytic converter rattling noise replacement
  • Failed emissions test need new cat Magnaflow
  • Magnaflow vs Walker catalytic converter comparison
  • Best universal catalytic converter for P0420
  • Check engine light P0430 what to do
  • Universal cat converter installation welding required
  • Magnaflow 51204 fits my car?

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMagnaflow
Part NumberM001 51204

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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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