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AP Exhaust 645442 Catalytic Converter - Rear
| Brand | AP Exhaust 645442 |
|---|---|
| Position | Rear |
| Body Material | Stainless steel |
| Inlet Gasket | Yes |
| Inlet Hardware | None |
| Inlet Type A | 3 bolt welded flange |
| O2 Sensor Ports | None |
| Outlet Gasket | Yes |
| Outlet Hardware | Yes |
| Outlet Type A | 2 bolt welded flange w/ gasket stub |
| Overall Length (IN) | 18.75 |
| Overall Length (IN) | 18.75 (w/ studs) |
| Substrate Material | Ceramic |
| Type | Federal / epa direct-fit |
| Fits | Ford and Mazda · 49 vehicles |
Direct-fit replacement. Built to exact OE dimensions for straightforward installation.
Ceramic substrate. Promotes efficient converter loading for better performance.
Stainless steel body. Helps resist corrosion in demanding exhaust conditions.
$248.99Free shipping
In stock · usually ships same day before 1pm CST
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Direct-Fit Catalytic Converter for Ranger and B-Series
AP Exhaust 645442 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 to support efficient exhaust flow and emissions control on select Ford Ranger and Mazda B3000/B4000 applications.
Fits 2004-2006 Ford Ranger, rear. Fits 2004-2006 Mazda B3000, rear. Fits 2004-2006 Mazda B4000, rear.
Key Features
- Federal / EPA direct-fit design for OE-style replacement
- Stainless steel body for corrosion resistance
- Ceramic substrate material
- 3-bolt welded flange inlet
- 2-bolt welded flange outlet with gasket stub
- Inlet gasket and outlet gasket included
- Outlet hardware included
- No O2 sensor ports
- Overall length: 18.75 in. with studs
Detailed Description
AP Exhaust part number 645442 is engineered for rear exhaust placement on select 2004-2006 Ford Ranger and Mazda B3000/B4000 models. The converter is built to OE dimensions for direct replacement, helping maintain proper exhaust routing and factory-style fitment. AP Emissions Technologies uses advanced manufacturing methods and automated production processes to keep dimensions consistent across each unit.
The ARISTO substrate chemistry referenced by the manufacturer is used to support efficient catalyst loading and converter performance while helping control production cost. For buyers searching for a 2004-2006 Ford Ranger rear catalytic converter or a direct-fit Mazda B3000 / B4000 catalytic converter, AP Exhaust 645442 provides a straightforward replacement option.
This part cross-references Walker (e.g., 16442, 16443) for the same application.
Common Problems It Can Address
- Failed emissions test due to a worn or inefficient converter
- Check engine light related to catalyst efficiency codes
- Exhaust restriction from a deteriorated substrate
- Rust or damage in the original rear converter assembly
- Fitment issues when replacing a damaged OE-style converter
Installation Notes and Tips
Verify the vehicle’s emissions certification and rear-position application before ordering. This converter is listed for Federal and California emissions configurations, with restrictions noted for vehicles licensed in CA, CO, ME, and NY; check local regulations before installation. Confirm flange style, overall length, and the absence of O2 sensor ports against the original part to ensure proper installation.
Because this unit uses welded flanges and includes gaskets, it is suited to direct replacement on the listed applications. Inspect adjoining exhaust components, hangers, and fasteners for wear before installation to avoid leaks or repeat repairs.
Quality Assurance
AP Exhaust builds this converter to exact OE dimensions using controlled manufacturing processes and stainless steel construction for consistent fitment on the listed Ford Ranger and Mazda applications. Part number 645442 is produced as a Federal / EPA direct-fit replacement for the specified rear-position vehicles.
This part fits 49 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 |
|---|---|---|---|---|---|---|---|
| 2006 | Ford | Ranger | 4.0L | V6 | 111.5" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 4.0L | V6 | 111.6" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 4.0L | V6 | 117.6" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 4.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 4.0L | V6 | 125.9" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | 125.9" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | 117.6" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | 111.6" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | 111.5" | Rear | Direct Fit; (04-06); 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. |
| 2006 | Ford | Ranger | 4.0L | V6 | — | Rear | 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. |
| 2006 | Ford | Ranger | 3.0L | V6 | — | Rear | 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. |
| 2006 | Mazda | B3000 | 3.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2006 | Mazda | B3000 | 3.0L | V6 | 111.6" | N/A | Direct Fit; (04-06); 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. |
| 2006 | Mazda | B3000 | 3.0L | V6 | — | Rear | 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. |
| 2006 | Mazda | B4000 | 4.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2006 | Mazda | B4000 | 4.0L | V6 | — | Rear | 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. |
| 2005 | Ford | Ranger | 4.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 4.0L | V6 | 117.5" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 4.0L | V6 | 111.5" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 3.0L | V6 | 111.5" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 3.0L | V6 | 117.5" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 3.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2005 | Ford | Ranger | 4.0L | V6 | — | Rear | 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. |
| 2005 | Ford | Ranger | 3.0L | V6 | — | Rear | 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. |
| 2005 | Mazda | B3000 | 3.0L | V6 | 111.6" | N/A | Direct Fit; (04-06); 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. |
| 2005 | Mazda | B3000 | 3.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2005 | Mazda | B3000 | 3.0L | V6 | — | Rear | 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. |
| 2005 | Mazda | B4000 | 4.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2005 | Mazda | B4000 | 4.0L | V6 | — | Rear | 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | 117.6" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | 125.9" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | 111.6" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | 111.4" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | 125.7" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | 117.6" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | 111.6" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | 111.4" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | 125.9" | Rear | Direct Fit; (04-06); 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. |
| 2004 | Ford | Ranger | 4.0L | V6 | — | Rear | 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. |
| 2004 | Ford | Ranger | 3.0L | V6 | — | Rear | 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. |
| 2004 | Mazda | B3000 | 3.0L | V6 | 125.7" | N/A | Direct Fit; (04-06); 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. |
| 2004 | Mazda | B3000 | 3.0L | V6 | 111.6" | N/A | Direct Fit; (04-06); 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. |
| 2004 | Mazda | B3000 | 3.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2004 | Mazda | B3000 | 3.0L | V6 | — | Rear | 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. |
| 2004 | Mazda | B4000 | 4.0L | V6 | 125.7" | N/A | Direct Fit; (04-06); 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. |
| 2004 | Mazda | B4000 | 4.0L | V6 | 125.9" | N/A | Direct Fit; (04-06); 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. |
| 2004 | Mazda | B4000 | 4.0L | V6 | — | Rear | 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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