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AP Exhaust 645231 Catalytic Converter

Brand	AP Exhaust 645231
Body Material	Stainless steel
Inlet Gasket	Not required
Inlet Hardware	None
Inlet Type A	2 bolt loose flange w/ flare
Inlet Type B	2 bolt loose flange w/ flare
O2 Sensor Ports	4
Outlet Gasket	Not required
Outlet Hardware	Yes
Outlet Type A	3.00" od pipe
Overall Length (IN)	29
Substrate Material	Ceramic
Type	Federal / epa direct-fit
Fits	Dodge and Ram · 20 vehicles

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

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

Ceramic substrate. Supports efficient converter performance.

$641.84Free shipping

In stock · usually ships same day before 1pm CST

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Direct-Fit Catalytic Converter for Ram and Dodge Ram 1500

AP Exhaust 645231 is a Federal / EPA direct-fit catalytic converter built for exact OE dimensions and fitment. It uses a stainless steel body with a ceramic substrate and is engineered for 2009-2012 Ram 1500 and Dodge Ram 1500 applications listed below.

Key Features

Federal / EPA direct-fit design for OE-style replacement
Stainless steel body for corrosion resistance
Ceramic substrate material
2-bolt loose flange w/ flare inlet on both sides
3.00" OD pipe outlet
4 O2 sensor ports
Overall length: 29 inches
Outlet hardware included; inlet gasket not required

Product Details

AP Exhaust part number 645231 is built using ARISTO substrate chemistry and AP Emissions Technologies manufacturing processes that focus on consistent converter loading, OE-style dimensions, and repeatable fitment. For buyers searching for a direct-fit catalytic converter for a 2011-2012 Ram 1500 or a 2009-2010 Dodge Ram 1500 4.7L, this unit is configured to match the listed emissions and exhaust layouts, including single-exhaust applications where noted. The stainless steel construction and ceramic substrate support proper exhaust flow and emissions control in a replacement-format converter.

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

Common Issues This Part May Address

Failed emissions test due to a worn or inefficient catalytic converter
Check engine light related to catalyst efficiency codes
Restricted exhaust flow from a deteriorated converter substrate
Exhaust leaks at the converter connection points
Replacement need after damage, contamination, or internal breakdown

Installation Notes and Fitment

Compatible with 2011-2012 Ram 1500, N/A, direct fit; Federal and California emissions; w/ single exhaust. Compatible with 2011-2012 Ram 1500, N/A, direct fit; Federal and California emissions. Compatible with 2009-2010 Dodge Ram 1500, N/A, direct fit; 4.7L engine; Federal and California emissions; w/ single exhaust. Compatible with 2009-2010 Dodge Ram 1500, N/A, direct fit; Federal and California emissions.

Verify emissions configuration, engine size, and exhaust layout before installation. The inlet uses a 2-bolt loose flange with flare, and the outlet is a 3.00" OD pipe with outlet hardware provided. Inlet gasket is not required.

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 control. Part number 645231 is a direct-fit replacement for the listed Ram 1500 and Dodge Ram 1500 applications.

This part fits 20 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Wheel Base	Position	Notes
2012	Ram	1500	4.7L	V8	120.5"	N/A	Direct Fit; (11-12); 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.; w/ Single Exhaust
2012	Ram	1500	4.7L	V8	140.5"	N/A	Direct Fit; (11-12); 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.; w/ Single Exhaust
2012	Ram	1500	4.7L	V8	—	N/A	Direct 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.
2011	Ram	1500	4.7L	V8	120.5"	N/A	Direct Fit; (11-12); 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.; w/ Single Exhaust
2011	Ram	1500	4.7L	V8	140.5"	N/A	Direct Fit; (11-12); 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.; w/ Single Exhaust
2011	Ram	1500	4.7L	V8	—	N/A	Direct 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.
2010	Dodge	Ram 1500	4.7L	V8	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	4.7L	V8	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	5.7L	V8	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	5.7L	V8	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	3.7L	V6	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	3.7L	V6	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2010	Dodge	Ram 1500	4.7L	V8	—	N/A	Direct 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.
2009	Dodge	Ram 1500	4.7L	V8	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	4.7L	V8	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	5.7L	V8	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	5.7L	V8	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	3.7L	V6	120.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	3.7L	V6	140.0"	N/A	Direct Fit; (4.7L Eng.); 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.; w/ Single Exhaust
2009	Dodge	Ram 1500	4.7L	V8	—	N/A	Direct 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.
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