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20 Best Is300 Catalytic Converter Oem of 2025 – Romance University

After hours researching and comparing all models on the market, Romance University finds out the Best Is300 Catalytic Converter Oem of 2025. Check our ranking below.

2,941 Reviews Scanned

Rank No. #1
PHILTOP 1PC High Flow Catalytic Converter for 2001 2002 2003 2004 2005 IS300, Automotive Replacement Catalytic Converters OEM 54666 (EPA Compliant)
PHILTOP 1PC High Flow Catalytic Converter for 2001 2002 2003 2004 2005 IS300, Automotive Replacement Catalytic Converters OEM 54666 (EPA Compliant)
  • [Vehicle Fitment] -- PHILTOP Catalytic Convertor Compatible with 2001-2005 IS300.
  • [Reference Number] -- Catalytic Converter OEM Part Number: 54666. This Catalytic Converter is constructed to meet or even exceed OEM quality.
  • [ATTENTION] -- EPA compliant catalytic converters cannot be sold or installed in California and Colorado and, under certain circumstances, in Maine and New York. Check your vehicle's Emission Control Information Label and your state's aftermarket converter regulations to select the proper catalytic converter.
  • [Direct Fit Design] -- Direct-Fit high flow catalytic converter is designed to meet or even exceed OE quality and performance standards. And all installation holes are firmly and exactly fixed with attached gaskets and hardware.
  • [EASY INSTALLATION]: The kit comes with necessary gaskets and hardware for replacement.so as to help you with hassle-free installation, no need to modify any part.Plug and play design, no modification or drilling, quick installation.
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Rank No. #2
A-Premium Exhaust Manifold Catalytic Converter Kit Direct-Fit Compatible with Lexus IS300 2001-2005 3.0L, GS300 1998-2005 3.0L, SC300 1998-2000 3.0L & Toyota Supra 1998 3.0L, EPA Compliant
A-Premium Exhaust Manifold Catalytic Converter Kit Direct-Fit Compatible with Lexus IS300 2001-2005 3.0L, GS300 1998-2005 3.0L, SC300 1998-2000 3.0L & Toyota Supra 1998 3.0L, EPA Compliant
  • [Vehicle Fitment]: Compatible with Lexus IS300 2001-2005 L6 3.0L, GS300 1998-2005 L6 3.0L, SC300 1998-2000 L6 3.0L; Compatible with Toyota Supra 1998 L6 3.0L --- Exhaust Manifold
  • [Reference Number]: 16354, 674-642, 674642, 40486, 1714046030, 1714046080
  • [Specification]: ① E.P.A. Compliant: Yes; ② Vehicle's Emissions Specifications: Federal Emissions; ③ Restricted States: CA, NY, CO, ME; ④ Body Material: Stainless Steel; ⑤ Inlet Type: 4 Bolt Welded Flange; ⑥ Inlet Quantity: 2; ⑦ Outlet Type: 3 Bolt Welded Flange; ⑧ Outlet Quantity: 1; ⑨ Mounting Hardware Included: No
  • [E.P.A Compliant]: EPA-compliant catalytic converters cannot be sold or installed in California and Colorado and, under certain circumstances, in Maine and New York. Check your vehicle's Emission Control Information Label and your state's aftermarket converter regulations to select the proper catalytic converter.
  • [Buy with Confidence]: A-Premium offers a one-year unlimited-mileage guarantee on our meticulously crafted Catalytic Converter. We offer a wide variety of automotive accessory categories, ensuring that you can hit the road with peace of mind.
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Rank No. #3
KAX 1PC High Flow Catalytic Converter Kit Compatible with Lexus IS300 2001-2005 Stainless Steel Catalyst Convertor OE 54666 Direct-Fit,EPA Compliant
KAX 1PC High Flow Catalytic Converter Kit Compatible with Lexus IS300 2001-2005 Stainless Steel Catalyst Convertor OE 54666 Direct-Fit,EPA Compliant
  • Vehicle Fitment: KAX Direct-Fit Catalytic Converter Compatible with Lexus IS300 2001-2005
  • Reference Number:54666
  • High Quality: The stainless steel body of high-quality aluminized pipes is not easy to rust, ensuring excellent oxygen storage capacity and long service life. The double-layer high temperature resistant ceramic carrier greatly increases the flow rate and surface area, thereby improving power and fuel economy
  • Easy Installation: The kit comes with necessary gaskets and hardware for replacement, so as to help you with hassle-free installation, no need to modify any part and doesn't require specialized fabrication and welding.
  • Notification: The catalytic converters meet OBD II Standards but not CARB requirements. They are legal in most states except California and New York; however, they are not legal in vehicles that meet CA emission standards
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Rank No. #4
PHILTOP Front Catalytic Converter Kit Compatible with 2001 2002 2003 2004 2005 IS300 3.0L Stainless Steel Catalytic Converter Replace# 54666, 642223, 40386 (EPA Compliant)
PHILTOP Front Catalytic Converter Kit Compatible with 2001 2002 2003 2004 2005 IS300 3.0L Stainless Steel Catalytic Converter Replace# 54666, 642223, 40386 (EPA Compliant)
  • Fitment : PHILTOP Catalytic Convertor Compatible with 2001-2005 IS300 3.0L
  • Standard OEM Specification : Catalytic Converter OEM Part Number # 54666, 642223, 40386
  • Excellent Material : The stainless steel body of high-quality aluminized pipes is not easy to rust, ensuring excellent oxygen storage capacity and long service life. The double-layer high temperature resistant ceramic carrier greatly increases the flow rate and surface area, thereby improving power and fuel economy
  • Direct installation : The kit comes with necessary gaskets and hardware for replacement.so as to help you with hassle-free installation, no need to modify any part
  • ATTENTION : The products have been certified by EPA. EPA compliant catalytic converters cannot be sold or installed in California and Colorado and, under certain circumstances, in Maine and New York. Check your vehicle's Emission Control Information Label and your state's aftermarket converter regulations to select the proper catalytic converter
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Rank No. #5
LELEHOKA Exhaust Manifold Catalytic Converter Kit Direct-Fit Compatible with Lexus GS300 1998-2005 3.0L, IS300 2001-2005 3.0L, SC300 1998-2000 3.0L & Toyota Supra 1998 3.0L
LELEHOKA Exhaust Manifold Catalytic Converter Kit Direct-Fit Compatible with Lexus GS300 1998-2005 3.0L, IS300 2001-2005 3.0L, SC300 1998-2000 3.0L & Toyota Supra 1998 3.0L
  • Compatible with: Lexus IS300 2001-2005 L6 3.0L, GS300 1998-2005 L6 3.0L, SC300 1998-2000 L6 3.0L; Compatible with Toyota Supra 1998 L6 3.0L --- Exhaust Manifold
  • Replace Part Number: 674642,16354, 674-642, 40486, 1714046030, 1714046080
  • Our catalytic converters are precisely-built to meet OEM specifications and have EPA certification. High flow design to provide more oxygen to your engine for an increase in power and performance. Meets criteria specified by U.S. Environmental Protection Agency(EPA). Contains precious metals to reduce tailpipe emissions. Durably designed of our catalytic converter
  • Attention: This item can be used in most places except CA, CO, NY or ME. Not for Use in California, Maine, Colorado or New York Registered Vehicles, please confirm before purchase, thank you
  • WARRANTY: All items listed are 100% Brand New and come with a warranty against defects! The warranty does not cover shipping, labor, or any other related charges. Damages due to shipping, installation, and incidental fees are non-refundable. Items that have been installed and altered are non-returnable.
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Last update on 2026-02-07 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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Romance University has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Is300 Catalytic Converter Oem that you consider buying. Your questions might include the following:

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