Front & Rear Catalytic Converter Compatible with 2004-2007

In this review the author looks at the Front & Rear Catalytic Converter compatible with 2004-2006 Lexus RX330, 2004-2007 Toyota Highlander and 2004-2006 Toyota Sienna AWD 3.3L V6 models. The bottom line: this is a direct-fit replacement for owners who need an EPA-certified, OEM-spec unit built with stainless steel and a noble-metal coated ceramic substrate. It is best for non-CARB states and for vehicles specifically with the 3.3L V6 engine; verify your model before ordering because it will not fit the 3.3L Full Hybrid EV-Gas (FHEV) variants.

Key Features

• EPA certification: The converter is approved for federal emissions standards, ensuring legal use in non-CARB states and compliance with EPA requirements.
• OEM fitment: Reference OEM part numbers 750056, 750053, 58144 and 57128 are provided to help confirm vehicle compatibility and simplify parts matching.
• Construction: A stainless steel housing improves durability against corrosion and road exposure compared with lesser metals.
• Catalyst formulation: Porous ceramic with platinum, rhodium and palladium enhances conversion of exhaust gases for improved purification performance.
• Direct installation: Designed to connect to the exhaust manifold and downstream pipe with standard fasteners, making it suitable for shop installation or experienced DIY.
• Vehicle-specific fit: Built specifically for 3.3L V6 models on the listed Lexus and Toyota vehicles, reducing fitment guesswork when matched correctly.

Who It's For

This catalytic converter is aimed at owners of 2004-2006 Lexus RX330, 2004-2007 Toyota Highlander and 2004-2006 Toyota Sienna AWD who specifically have the 3.3L V6 engine and need an EPA-certified replacement that mirrors OEM specifications. It suits drivers who want a durable stainless steel assembly and the proven noble-metal catalyst mix for reliable emissions control.

It is not suitable for owners in CARB-regulated states such as California, Colorado, New York or Maine, nor for vehicles fitted with the 3.3L Full Hybrid EV-Gas (FHEV) powertrain. Buyers who require CARB-compliant parts or hybrid-specific converters should look for models explicitly labeled for those regulations and configurations.

Pros & Cons

Pros

• EPA certification provides compliance for federal emissions standards in permitted states.
• Stainless steel body offers improved durability against road corrosion and heat.
• Noble-metal coated ceramic substrate (Pt, Rh, Pd) enhances catalytic conversion efficiency.
• Reference OEM part numbers simplify matching and professional installation.

Cons

• Not CARB-compliant, making it illegal for sale or use in some states.
• Only fits non-hybrid 3.3L V6 models, so hybrid owners must seek a different unit.

Specifications

Compatible Vehicles	2004-2006 Lexus RX330; 2004-2007 Toyota Highlander; 2004-2006 Toyota Sienna AWD
Engine Fitment	3.3L V6 (non-hybrid)
Certification	U.S. EPA approved (federal only)
Construction	Stainless steel body with porous ceramic substrate
Catalyst Materials	Platinum (Pt), Rhodium (Rh), Palladium (Pd)
OEM Reference Numbers	750056, 750053, 58144, 57128

Our Verdict

This catalytic converter is a practical, value-oriented replacement for owners of the specified 3.3L V6 Lexus and Toyota models who need an EPA-certified, OEM-spec part with durable stainless construction and an effective noble-metal catalyst. It delivers reliable emissions performance if your vehicle matches the non-hybrid 3.3L fitment and you are outside CARB-regulated states; hybrid owners and buyers in CARB states should select a compliant alternative.

Frequently Asked Questions

Will this fit my hybrid RX330?
It does not fit the 3.3L Full Hybrid EV-Gas (FHEV) models; this unit is for non-hybrid 3.3L V6 only.

Is this legal to install in California?
No, this catalytic converter is EPA-certified for federal use and is not CARB-compliant, so it cannot be legally sold or installed in CARB-regulated states.

Are OEM part numbers included to verify fit?
Yes, the listing gives reference OEM part numbers 750056, 750053, 58144 and 57128 to assist with compatibility checks.