AP Exhaust 641338 Catalytic Converter with Integrated Exhaust Manifold - Front

Direct-Fit Manifold Catalytic Converter

AP Exhaust 641338 is a Federal / EPA direct-fit manifold catalytic converter built for OE-style fitment and emissions control. It combines a stainless steel body with a ceramic substrate and integrated exhaust manifold design for a precise replacement on select Chevrolet Colorado, GMC Canyon, Hummer H3, and Isuzu i-370 applications.

Fits 2007-2012 Chevrolet Colorado, front. Fits 2007-2012 GMC Canyon, front. Fits 2007-2008 Hummer H3, front. Fits 2007-2008 Isuzu i-370, front.

Key Features

• Part number 641338
• Part type: catalytic converter with integrated exhaust manifold
• Federal / EPA direct-fit manifold design
• Stainless steel body for corrosion resistance
• Ceramic substrate material
• 9-bolt welded flange inlet and 3-bolt welded flange outlet with gasket stub
• 2 O2 sensor ports
• Inlet gasket and outlet gasket included
• Built to OE dimensions and fitment targets

Detailed Description

AP Exhaust 641338 is engineered for vehicles that use a manifold-style catalytic converter assembly, making it a direct replacement for the original exhaust/emissions unit. The stainless steel housing and ceramic substrate are paired with AP Exhaust’s ARISTO substrate chemistry and modern manufacturing processes to support efficient converter loading while maintaining consistent dimensions for installation accuracy. This part cross-references Monroe Shocks & Struts (e.g., 12655846) for the same application.

Use this AP Exhaust catalytic converter when replacing a worn, damaged, or restricted manifold converter on a 2007-2012 Chevrolet Colorado or GMC Canyon, or on a 2007-2008 Hummer H3 or Isuzu i-370 with the listed engine and emissions configurations. The AP Exhaust 641338 is built for direct-fit service where OE-style flange locations, sensor ports, and gasket interfaces matter.

What It Helps Solve

• Check engine light concerns related to catalyst efficiency or exhaust flow
• Restricted exhaust flow from a failing manifold converter
• Exhaust leaks at the manifold-to-pipe connection points
• Damaged or rusted OE converter/manifold assembly
• Emissions test failures tied to converter performance

Installation Notes and Tips

Verify engine size, emissions type, and position before ordering. This part is listed for front applications on the vehicles shown and includes 2 O2 sensor ports, inlet and outlet gaskets, a 9-bolt welded flange inlet, and a 3-bolt welded flange outlet with gasket stub. No inlet or outlet hardware is listed. Confirm local emissions regulations before installation; this part is not for sale or use on vehicles licensed in CA, CO, ME, or NY, and restrictions may apply in other states.

Quality Assurance

AP Exhaust uses automated workstations, spinner welding equipment, and high-speed production lines to build converters to exact OE dimensions and fitment targets. The manufacturer’s ARISTO substrate chemistry and production controls are used to support consistent converter construction and emissions-system replacement quality.