AP Exhaust 645773 Catalytic Converter - Rear
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AP Exhaust

AP Exhaust 645773 Catalytic Converter - Rear

Brand AP Exhaust 645773
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 2
Outlet Gasket Yes
Outlet Hardware Yes
Outlet Type A 2 bolt welded flange
Overall Length (IN) 89
Substrate Material Ceramic
Type Federal / epa direct-fit
Fits Mitsubishi · 12 vehicles

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

Stainless steel body. Helps resist corrosion in demanding exhaust conditions.

Ceramic substrate. Proprietary chemistry promotes efficient converter performance.

$432.39Free shipping
In stock · usually ships same day before 1pm CST
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Order total $432.39
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Free returns within 60 days if it doesn't fit when fitment is verified.
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AP Exhaust 645773 Catalytic Converter

AP Exhaust 645773 is a Federal / EPA direct-fit catalytic converter built for rear installation on select Mitsubishi Lancer applications. It uses a ceramic substrate and stainless steel body construction to support emissions control while matching OE dimensions for proper fitment.

For Mitsubishi Lancer owners searching for a rear catalytic converter replacement, this AP Exhaust unit is engineered around exact fitment requirements and emissions compliance details listed for the application. The 645773 part number is also supported by AP Emissions Technologies manufacturing methods that focus on consistent dimensions and converter efficiency.

Key Features

  • Federal / EPA direct-fit catalytic converter
  • Fits rear position applications on Mitsubishi Lancer
  • Stainless steel body for corrosion resistance
  • Ceramic substrate material
  • 2-bolt welded flange inlet and outlet connections
  • Includes inlet gasket, outlet gasket, and outlet hardware
  • Two O2 sensor ports
  • Overall length: 89 in.

Detailed Description

AP Exhaust 645773 is built for 2008-2017 Mitsubishi Lancer rear applications, with a separate 2009-2010 Mitsubishi Lancer rear listing for California emissions. The converter is formed to OE dimensions for direct-fit installation, helping maintain proper exhaust routing and emissions-system alignment. If you are replacing a rear catalytic converter on a Mitsubishi Lancer, this part number provides a fitment-specific solution for Federal / EPA applications.

The converter uses a ceramic substrate inside a stainless steel body, along with 2-bolt welded flange inlet and outlet connections. AP Exhaust’s manufacturing process uses automated workstations, spinner welding equipment, and high-speed production lines to keep dimensions consistent across production. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

What It Helps Address

  • Failed catalytic converter efficiency codes
  • Restricted exhaust flow from a worn substrate
  • Emissions test failures tied to rear converter performance
  • Exhaust leaks at flange connection points
  • Fitment issues from non-direct replacement parts

Installation Notes and Tips

Confirm the vehicle’s emissions certification before ordering. Fits 2008-2017 Mitsubishi Lancer, rear, direct fit; SULEV emissions; Federal and California emissions. Fits 2009-2010 Mitsubishi Lancer, rear, direct fit; SULEV emissions; California emissions. Not for sale or use on vehicles licensed in CA, CO, ME, or NY where noted in the fitment data. Verify O2 sensor port alignment, flange style, and exhaust routing before installation.

Quality Assurance

AP Exhaust uses advanced manufacturing controls to build converters to exact OE dimensions and fitment. The ARISTO substrate chemistry is used to support efficient converter loading and consistent performance characteristics across production.

Related reading

This part fits 12 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2017MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2016MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2015MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2014MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2013MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2012MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2011MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2010MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2010MitsubishiLancer2.4LL4RearDirect Fit; SULEV Emissions; 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.
2009MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.
2009MitsubishiLancer2.4LL4RearDirect Fit; SULEV Emissions; 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.
2008MitsubishiLancer2.0LL4RearDirect Fit; SULEV Emissions; 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.