Catalytic Converter Compatible with Honda Acura 3.5L - EPA Compliant

In this review the focus is on the PHILTOP catalytic converter compatible with a range of Honda and Acura 3.5L models. The bottom line: this unit is for owners who need an EPA approved replacement for federal emissions vehicles and value a high flow honeycomb substrate that aims to restore exhaust efficiency. Our review finds it best suited to drivers replacing a failed converter on supported models who want a direct-fit aftermarket option and who are not registered in states that restrict non-CA-certified parts.

Key Features

• EPA Approved: Meets EPA requirements for federal emissions vehicles so it can be used in states that allow federal parts, giving purchasers regulatory peace of mind.
• Wide Fitment Coverage: Lists compatibility across Pilot, Odyssey, Accord, RDX, TL, Ridgeline, Crosstour, RL and TSX model years to simplify selection for many 3.5L Honda and Acura owners.
• High Flow Design: Internal honeycomb ceramic substrate with a porous design increases flow rate and surface area to help maintain engine performance and exhaust scavenging.
• OE Part References: Matches OE part numbers 16658, 16643 and 16447 so installers can verify fitment against factory references.
• Hardware Included: Arrives with necessary hardware in most cases, which reduces the need to source extra components during installation.

Who It's For

This catalytic converter is aimed at owners of compatible Honda and Acura vehicles with federal emissions specifications who need a replacement for a damaged or clogged converter. It fits a broad range of 3.5L engines and some adjacent 3.7L applications, making it a practical single-purchase option for garages and DIYers familiar with exhaust work.

It is not suitable for vehicles registered in California, New York, or Maine since it is not legal to sell, install, or use there under local regulations. Buyers who require CARB-certified parts or who have uncommon exhaust modifications should look for a state-compliant or vehicle-specific OEM part instead.

Pros & Cons

Pros

• EPA approved for federal emissions use, offering legal compliance outside restricted states.
• High flow honeycomb substrate aims to restore exhaust efficiency and engine responsiveness.
• Broad vehicle fitment and included hardware improve value and reduce installation preparation.

Cons

• Fit and installation feedback is mixed, so some vehicles may require adjustments or professional installation to avoid check engine light issues.
• Not legal for sale or use in certain states, limiting availability to some buyers.

Specifications

Our Verdict

The PHILTOP catalytic converter is a practical, value-oriented replacement for owners of supported Honda and Acura 3.5L vehicles who need an EPA approved federal emissions unit. It offers a high flow ceramic core and broad fitment that make it a sensible option for many repairs, but buyers should confirm fitment carefully and be aware of state restrictions before purchase.

Frequently Asked Questions

Is this legal in all states?
It is only legal for federal emissions vehicles and cannot be sold, installed, or used in California, New York, or Maine.

Which OE part numbers does it match?
The converter references OE part numbers 16658, 16643 and 16447 for fitment verification.

Does it include installation hardware?
Most shipments include the necessary hardware, but buyers should confirm their package contents before starting installation.