SKU: 3984084406

Catalytic Converter for 2000-2004 Audi A6 Quattro 4.2L MagnaFlow 51664

Sale price$282.60 Regular price$314.00
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

Catalytic Converter for 2000-2004 Audi A6 Quattro 4.2L MagnaFlow 51664Overview: Keep the check engine light off with MagnaFlow OEM Grade Federal EPA Compliant Direct Fit Catalytic Converter 51664. 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 51664. 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. Designed to fit the 2000-2004 Audi A6 Quattro and 2002-2003 Audi S6, this direct-fit catalytic converter also interchanges with OE parts 4B3 254 550 GX, 4B3 253 058 BX, among others.

Note : Not For Sale in California

Interchange:

Brand  Interchange Part Number
Audi 4B3 253 058 AX
Audi 4B3 253 058 BX
Audi 4B3 254 550 CX
Audi 4B3 254 550 GX
Audi 4B3253058AX
Audi 4B3253058BX
Audi 4B3254550CX
Audi 4B3254550GX
Audi 4B3 253 058 AX
Audi 4B3 253 058 BX
Audi 4B3 254 550 CX
Audi 4B3 254 550 GX
Audi 4B3253058AX
Audi 4B3253058BX
Audi 4B3254550CX
Audi 4B3254550GX

Application:

Year Make Model Submodel Engine Size
2000 - 2004 Audi A6 Quattro 4.2L/V8
2002 - 2003 Audi S6 4.2L/V8

Specs:

Oxygen Sensor Location Pre and Post Converter
Overall Length (In.) 51
Substrate Material Ceramic
Air Tube Adaptable No
Converter Quantity 1
Inlet Attachment Bolt-On
Material Stainless Steel
Outlet Attachment Clamp-On
Finish Stainless Steel
Series OEM Grade
Main Piping Diameter (In.) 2.25
Subtitle Federal / EPA Compliant
Title OEM Grade Direct-Fit
Type Direct-Fit
Body Material 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: 3984084406

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4.5 ★★★★★
Based on 384 reviews
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Product Reviews
V
Verified Purchase
Vicky
San Leandro, US
★★★★★ 4
Beautiful, but clasp broke after 4 months
Color: F-Rose Gold
Beautiful, but clasp broke after 4 months.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
M
Verified Purchase
Melody Kennedy
Pawtucket, US
★★★★★ 5
Love it …. But
Color: F-Purple
I love this watch it’s really pretty I love purple and it certainly is all purple however the band is very difficult and I don’t think it latches tight it’s fallen off my wrist a couple of times so I’m took it off and I’m gonna just save it for going out or something but I really love it - I am disappointed with the band - Would not buy as a gift
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2022
D
Verified Purchase
Debra Arnold
Birmingham, US
★★★★★ 3
Purple watch
Color: F-Purple
The watch is cute but the magnet clasp is not sturdy so the watch continues to loosen up continously. So,I'm satisfied
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 13, 2025
M
Verified Purchase
Maria L Cicalese
Natrona Heights, US
★★★★★ 5
Beautiful Watches
Color: F-Rose Gold
I ordered three of these watches! They were delivered promptly. The seller was very responsive with my question regarding delivery as I wanted to receive them before my birthday of August 29th. As soon as I saw them I knew I made the right choice I ordered the black coffee brown and rose gold all three of them are beautiful they are by far the nicest watches I've ever owned I would say even nicer than my Movado. If you are thinking for a watch for yourself whether business or casual or a gift for someone for Christmas order one of these with the Platinum strap. You won't be disappointed!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 17, 2021
J
Verified Purchase
jonathan
Phoenix, US
★★★★★ 4
Make sure it fits
Color: F-Rose Gold
Looks nice
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026

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