AP Exhaust 644037 Catalytic Converter - Rear
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AP Exhaust

AP Exhaust 644037 Catalytic Converter - Rear

Brand AP Exhaust 644037
Position Rear
Body Material Stainless steel
Clamp Qty 1
Inlet Gasket Yes
Inlet Hardware None
Inlet Type A 2 bolt welded flange
O2 Sensor Ports 1
Outlet Gasket Not required
Outlet Hardware Yes
Outlet Type A 2 bolt welded flange
Outlet Type A 2.10" od pipe
Overall Length (IN) 40.25
Substrate Material Ceramic
Type Federal / epa direct-fit
Type Federal / epa direct-fit undercar
Fits Toyota · 4 vehicles

Direct-fit design. Built to exact OE dimensions for straightforward installation.

Stainless steel body. Helps resist corrosion for long service life.

Ceramic substrate. Proprietary chemistry promotes efficient converter performance.

Cross-references 1742028380 and 1742028570 for the same application. See all 2.

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Direct-Fit Catalytic Converter for Toyota RAV4

AP Exhaust 644037 is a Federal / EPA direct-fit catalytic converter built for rear installation on select 2004-2005 Toyota RAV4 models. It uses a stainless steel body, a ceramic substrate, and OE-style flange connections to support proper exhaust alignment and emissions system function.

Fits 2004-2005 Toyota RAV4, rear. This application requires Pipe #58574 to complete installation, and the OE system was originally a welded assembly. AP Exhaust 644037 is built to OE dimensions for a direct-fit replacement on the Toyota RAV4 rear exhaust position.

Key Features

  • Federal / EPA direct-fit catalytic converter
  • Stainless steel body for corrosion resistance
  • Ceramic substrate material
  • 2-bolt welded flange inlet and outlet design
  • 1 O2 sensor port
  • Inlet gasket included
  • Outlet hardware included
  • Overall length: 40.25 in.
  • Built to OE dimensions and fitment targets

Detailed Product Overview

AP Exhaust 644037 uses ARISTO substrate chemistry and advanced manufacturing methods to produce a converter with efficient catalyst loading and consistent fitment. Automated production, spinner welding, and high-speed assembly processes help maintain dimensional accuracy for the rear exhaust layout on the Toyota RAV4. The result is a direct-fit catalytic converter engineered for the 2004-2005 Toyota RAV4 rear position with the correct flange style and sensor port configuration.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Part Addresses

  • Failed catalytic converter efficiency codes
  • Restricted exhaust flow from a worn converter
  • Emissions test failure related to converter performance
  • Exhaust leaks at the rear converter connection
  • Fitment issues when replacing a welded OE assembly

Installation Notes and Tips

  • Compatible with 2004-2005 Toyota RAV4, rear.
  • Requires Pipe #58574 to complete installation.
  • OE system was a welded assembly, so cutting, resizing, or bushing may be required during installation.
  • Federal and California emissions notes are listed for this application; verify local emissions rules before installation.
  • Use the included inlet gasket and outlet hardware as specified by the application.

Quality Assurance

AP Exhaust manufactures this converter with OE-dimension fitment targets and controlled production processes to support consistent installation and emissions-system performance. The ARISTO substrate design and stainless steel construction reflect the brand’s focus on efficient converter loading and repeatable manufacturing quality.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2005ToyotaRAV42.4LL4RearDirect Fit; (Use w/ Ex. Pipe 58574); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2005ToyotaRAV42.4LL4RearDirect Fit; Requires Pipe #58574 to Complete Installation. OE is a Complete Welded Assembly.; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.; Direct fit converter may require resizing, cutting or bushing.
2004ToyotaRAV42.4LL4RearDirect Fit; (Use w/ Ex. Pipe 58574); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004ToyotaRAV42.4LL4RearDirect Fit; Requires Pipe #58574 to Complete Installation. OE is a Complete Welded Assembly.; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.; Direct fit converter may require resizing, cutting or bushing.
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
17420283801742028570