AP Exhaust 645436 Catalytic Converter - Left
OE Quality 60-Day Returns
AP Exhaust

AP Exhaust 645436 Catalytic Converter - Left

Brand AP Exhaust 645436
Position Left
Body Material Stainless steel
Inlet Gasket Not required
Inlet Hardware None
Inlet Type A 2 bolt loose flange w/ flare
O2 Sensor Ports 2
Outlet Gasket Not required
Outlet Hardware Yes
Outlet Type A 2.25" od pipe
Overall Length (IN) 45.75
Substrate Material Ceramic
Type Federal / epa direct-fit
Fits Dodge · 8 vehicles

Direct-fit design. Built to exact OE dimensions for easier installation and proper fit.

Stainless steel body. Helps resist corrosion for long-term durability.

Ceramic substrate. Engineered for efficient converter performance and lower cost.

$250.03Free shipping
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Free returns within 60 days if it doesn't fit when fitment is verified.
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AP Exhaust 645436 Catalytic Converter for Ram 1500

AP Exhaust 645436 is a Federal / EPA direct-fit catalytic converter built for exact OE dimensions and fitment. It is engineered for the 2004-2005 Dodge Ram 1500, Left position, with a stainless steel body and ceramic substrate for dependable exhaust system replacement.

Key Features

  • Direct-fit catalytic converter for the 2004-2005 Dodge Ram 1500, Left
  • Federal / EPA emissions configuration
  • Stainless steel body for corrosion resistance
  • Ceramic substrate material
  • 2-bolt loose flange inlet with flare
  • 2.25" OD pipe outlet
  • 2 O2 sensor ports
  • Overall length: 45.75 in.
  • Outlet hardware included; inlet gasket not required

Product Details

Part number 645436 uses AP Exhaust ARISTO substrate chemistry and modern manufacturing methods to support efficient catalyst loading while maintaining OE-style dimensions. That combination helps deliver a direct replacement for Ram 1500 exhaust service where proper fitment, emissions compliance, and sensor placement matter. If you are replacing a worn or restricted converter on a 2004-2005 Dodge Ram 1500, Left side, AP Exhaust 645436 provides the correct configuration for the listed application.

This part cross-references no listed alternate part numbers for the same application.

Common Problems This Part Can Address

  • Check engine light related to catalytic converter efficiency
  • Restricted exhaust flow from a failing converter
  • Emissions test failure on the listed Ram 1500 application
  • Exhaust leaks at the converter connection points
  • Incorrect fitment from a non-direct replacement converter

Installation Notes and Tips

Fits 2004-2005 Dodge Ram 1500, Left. Verify the vehicle’s emissions certification before installation; this Federal / EPA direct-fit converter is not for sale or use on vehicles licensed in CA, CO, ME, or NY, and restrictions may apply in other states. Confirm the 2-bolt loose flange w/ flare inlet, 2.25" OD pipe outlet, and 2 O2 sensor ports match the original exhaust layout before installation.

Quality Assurance

AP Exhaust builds this converter to OE dimensions using automated workstations, spinner welding equipment, and high-speed production lines to support consistent fitment and manufacturing accuracy.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersWheel BasePositionNotes
2005DodgeRam 15005.7LV8140.5"LeftDirect Fit; 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.
2005DodgeRam 15005.7LV8120.5"LeftDirect Fit; 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.
2005DodgeRam 15005.7LV8160.5"LeftDirect Fit; 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.
2005DodgeRam 15005.7LV8—LeftDirect Fit; 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.
2004DodgeRam 15005.7LV8140.5"LeftDirect Fit; 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.
2004DodgeRam 15005.7LV8160.5"LeftDirect Fit; 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.
2004DodgeRam 15005.7LV8120.5"LeftDirect Fit; 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.
2004DodgeRam 15005.7LV8—LeftDirect Fit; 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.