AP Exhaust 645858 Catalytic Converter
OE Quality 60-Day Returns
AP Exhaust

AP Exhaust 645858 Catalytic Converter

Brand AP Exhaust 645858
Body Material Stainless steel
Inlet Gasket Not required
Inlet Hardware None
Inlet Type A 2 bolt loose flange w/ spherical flare
Inlet Type B 2 bolt loose flange w/ spherical flare
O2 Sensor Ports 2
Outlet Gasket Not required
Outlet Hardware Yes
Outlet Type A 2.50" od pipe
Overall Length (IN) 57.5
Substrate Material Ceramic
Type Federal / epa direct-fit
Fits Dodge · 36 vehicles

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

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

Ceramic substrate. Proprietary chemistry promotes efficient converter performance.

$305.12Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $305.12
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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AP Exhaust 645858 Catalytic Converter

AP Exhaust 645858 is a Federal / EPA direct-fit catalytic converter built for exact OE dimensions and fitment. It uses a ceramic substrate and stainless steel body construction to support efficient exhaust flow and emissions control on select Dodge Ram trucks.

Compatible with 2000-2001 Dodge Ram 1500, Dodge Ram 2500, and Dodge Ram 3500 applications, this converter is built for direct replacement service where factory-style fitment matters. The 2-bolt loose flange inlet with spherical flare and 2.50-inch OD pipe outlet help match the original exhaust connection points.

  • Federal / EPA direct-fit catalytic converter
  • Stainless steel body for corrosion resistance
  • Ceramic substrate material
  • 2 O2 sensor ports
  • 2-bolt loose flange inlet with spherical flare
  • 2.50-inch OD pipe outlet
  • Overall length: 57.5 inches
  • Outlet hardware included; inlet gasket not required

OE-Style Fitment and Construction

AP Exhaust uses proprietary substrate chemistry and advanced manufacturing methods to produce converters with efficient loading and consistent fitment. Automated workstations, spinner welding equipment, and high-speed production lines are used to build units to OE dimensions, helping the AP Exhaust 645858 install cleanly on the intended Dodge Ram 1500, Ram 2500, and Ram 3500 exhaust layouts. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Converter Helps Address

  • Failed or restricted catalytic converter performance
  • Exhaust flow loss caused by a damaged substrate
  • Check engine light concerns related to catalyst efficiency
  • Exhaust leaks at worn flange connections
  • Fitment issues from non-OE-style replacement parts

Installation Notes

Verify emissions compliance before installation. This converter is listed for Federal and California emissions configurations on the covered Dodge Ram applications, but it is not for sale or use on vehicles licensed in CA, CO, ME, or NY. Confirm the inlet and outlet connection style, O2 sensor port count, and overall length against the original exhaust assembly before installation.

Quality Assurance

AP Exhaust builds this converter to OE dimensions using controlled manufacturing processes and stainless steel construction for consistent replacement quality. The ARISTO substrate design is used to support efficient converter loading and dependable emissions-system service.

Related reading

This part fits 36 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersWheel BasePositionNotes
2001DodgeRam 15005.2LV8119.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.2LV8155.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.2LV8135.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.2LV8139.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.9LV8135.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.9LV8139.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.9LV8119.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.9LV8155.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 15005.2LV8—N/ADirect 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.
2001DodgeRam 15005.9LV8—N/ADirect 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.
2001DodgeRam 25005.9LV8138.7"N/ADirect Fit; (00-01); 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.
2001DodgeRam 25005.9LV8154.7"N/ADirect Fit; (00-01); 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.
2001DodgeRam 25005.9LV8134.7"N/ADirect Fit; (00-01); 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.
2001DodgeRam 25005.9LV8—N/ADirect 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.
2001DodgeRam 35005.9LV8138.7"N/ADirect Fit; (00-01); 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.
2001DodgeRam 35005.9LV8154.7"N/ADirect Fit; (00-01); 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.
2001DodgeRam 35005.9LV8135.0"N/ADirect Fit; (00-01); 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.
2001DodgeRam 35005.9LV8—N/ADirect 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.
2000DodgeRam 15005.2LV8119.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.2LV8135.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.2LV8139.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.2LV8155.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.9LV8119.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.9LV8135.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.9LV8139.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.9LV8155.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 15005.2LV8—N/ADirect 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.
2000DodgeRam 15005.9LV8—N/ADirect 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.
2000DodgeRam 25005.9LV8154.7"N/ADirect Fit; (00-01); 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.
2000DodgeRam 25005.9LV8134.7"N/ADirect Fit; (00-01); 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.
2000DodgeRam 25005.9LV8138.7"N/ADirect Fit; (00-01); 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.
2000DodgeRam 25005.9LV8—N/ADirect 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.
2000DodgeRam 35005.9LV8135.0"N/ADirect Fit; (00-01); 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.
2000DodgeRam 35005.9LV8138.7"N/ADirect Fit; (00-01); 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.
2000DodgeRam 35005.9LV8154.7"N/ADirect Fit; (00-01); 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.
2000DodgeRam 35005.9LV8—N/ADirect 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.