Catalytic Converter for 2004-2006 Audi A8 Quattro 4.2L OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter
SKU: 4639118571

Catalytic Converter for 2004-2006 Audi A8 Quattro 4.2L OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Sale price$316.35 Regular price$351.50
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Ships within 48 hours · Estimated delivery Jul 5 - Jul 10

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Description

Catalytic Converter for 2004-2006 Audi A8 Quattro 4.2L OEM Grade Federal / EPA Compliant Direct-Fit Catalytic ConverterOverview: Keep the check engine light off with MagnaFlow OEM Grade Federal EPA Compliant Direct Fit Catalytic Converter 51966. With features including free flowing mandrel bent tubing and highly corrosion resistant, stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state of the art metrology department uses the latest 3D scanning systems during research

Overview:

Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51966. With features including free-flowing mandrel-bent tubing and highly corrosion resistant, stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE spun body design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency. This direct-fit catalytic converter is designed specifically for the 2004-2006 Audi A8 Quattro and interchanges with OE parts 4E0 254 551 X and 4E0 254 550 TX. Hardware is included to eliminate the hassle of working with corroded factory parts.

Note : Not For Sale in California

Interchange:

Brand  Interchange Part Number
Audi 4E0 254 550 TX
Audi 4E0 254 551 X
Audi 4E0254550TX
Audi 4E0254551X
Audi 4E0 254 550 TX
Audi 4E0 254 551 X
Audi 4E0254550TX
Audi 4E0254551X

Application:

Year Make Model Submodel Engine Size
2004 - 2006 Audi A8 Quattro 4.2L/V8

Specs:

Series OEM Grade
Subtitle Federal / EPA Compliant
Material Stainless Steel
Title OEM Grade Direct-Fit
Type Direct-Fit
Outlet Attachment Clamp-On
Inlet Attachment Bolt-On
Clamp Included Yes
Mounting Hardware Included Yes
Body Material Stainless Steel
Overall Length (In.) 83
Substrate Material Ceramic
Air Tube Adaptable No
Converter Quantity 1
Main Piping Diameter (In.) 2.5
Oxygen Sensor Location Pre and Post Converter
Finish Stainless Steel
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 4639118571

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4.5 ★★★★★
Based on 556 reviews
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Product Reviews
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Verified Purchase
RZA
Dallas, US
★★★★★ 5
Amazing Spark plugs
Smooth starting came after I fitted these Bosch 9614 double iridium plugs into my 2014 Honda Accord Sport, along with slightly better idling behavior. Longevity might come from those fine iridium tips; installing them felt straightforward enough. Yet here's the catch - the 9614 doesn't match what the factory actually specifies for the 2.4L engine in that year’s Accord. Most often, it's the 9694 or some other OEM-recommended plug you’d want instead
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
A
Verified Purchase
Akram M.
Fort Morgan, US
★★★★★ 5
Great plug
Not sure about gas mileage, but these definitely improved the performance of my little 1.8 L Honda Civic, not sure if it’s because the old Plex were just old and weak or just because these are that much better. Acceleration is much better and engine or idle is much smoother
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 28, 2025
K
Verified Purchase
Kheino Campbell
Lowell, US
★★★★★ 5
Very affordable compare to the Honda OE
Prefect fit and very affordable for the brand.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
B
Verified Purchase
Bee J Xiong
Port Orchard, US
★★★★★ 5
very good spark plugs for me.
i bought a 4 pack of BOSCH 9614 OE Fine Wire Double Iridium Spark Plug - Pack of 4 from Amazon prime i am just a regular dude i don't get reward or get free stuffs or free spark plugs, from this review...had my cousin install these BOSCH 9614 OE Fine Wire Double Iridium Spark Plug - Pack of 4...drove it right away i can tell a big difference seems a little more power and it purrs so smooth lols..and it sparks up right away for the engine to start smoothly i can tell a difference for sure. i recommend this for hondas dunno about the rest but i have some regular bosch spark plugs in my toyota too the cheapest one Bosch Platinum Spark Plug 6702, though but still good...just wanted to try the better expensive spark plugs and can tell a difference.. so yea i do recommend these for ur hondas..peace out.
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Reviewed in the United States on October 19, 2024
T
Verified Purchase
Tim
Louisville, US
★★★★★ 5
Bosch is a good product in any form
I had used these plugs before in my 03 Honda Element and they performed well for 5 years or more so I considered these for use in my now 07 Honda CRV.
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Reviewed in the United States on January 13, 2026

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