Catalytic Converters & Emissions Parts
Keep your check engine light off and pass emissions with quality catalytic converters from CATCO, AP Emissions, and other trusted brands. We carry both direct-fit converters for easy bolt-on installation and universal converters for custom applications.
Why Catalytic Converters Fail
Catalytic converters typically fail due to:
- Age and mileage - Substrate breakdown over 100,000+ miles
- Engine problems - Rich fuel mixture, misfires, or coolant leaks damage the catalyst
- Physical damage - Road debris, speed bumps, or theft
- Oil burning - Contaminates the catalyst surface
Types of Catalytic Converters
Direct-Fit Converters - Vehicle-specific design with factory-style flanges and hangers. Bolt-on installation with no fabrication required.
Universal Converters - Weld-in design for custom applications or when direct-fit isn't available. Requires exhaust fabrication.
High-Flow Performance Cats - Larger substrate for reduced backpressure. Popular for performance builds that need emissions compliance.
Related Collections
- Exhaust Systems - Complete performance systems
- Accessories - Gaskets, clamps, and O2 sensor bungs
- Shop by Vehicle - Find the exact fit for your vehicle
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Best AP Exhaust catalytic-converter for 2012-2011 Audi A8 Quattro Front Rig | Direct Fit | EPA/CARB Compliant | 644130
$1,256.26
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2012-2010 Jaguar XF Right | Direct Fit | EPA/CARB Compliant | 644124
$1,282.96
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2012-2010 Jaguar XF Left | Direct Fit | EPA/CARB Compliant | 644123
$1,269.20
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2020-2016 Honda HR-V Rear | Direct Fit | EPA/CARB Compliant | 644122
$1,047.58
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2015-2013 Cadillac ATS Front | Direct Fit | EPA/CARB Compliant | 644121
$1,089.54
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2011-2005 Chevrolet Corvette Right | Direct Fit | EPA/CARB Compliant | 644120
$1,217.94
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2011-2005 Chevrolet Corvette Left | Direct Fit | EPA/CARB Compliant | 644119
$1,221.62
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2019-2010 Subaru Outback Left | Direct Fit | EPA/CARB Compliant | 644117
$1,763.88
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2010-2007 Volvo S80 Rear | Direct Fit | EPA/CARB Compliant | 644116
$1,596.32
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter | Direct Fit | EPA/CARB Compliant | 644115
$1,947.04
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
Sold Out
Best AP Exhaust catalytic-converter | Direct Fit | EPA/CARB Compliant | 644114
$2,438.66
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
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Best AP Exhaust catalytic-converter for 2015-2012 Audi A6 Quattro Right | Direct Fit | EPA/CARB Compliant | 644113
$1,462.56
ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...
Frequently Asked Questions
What's the difference between a direct-fit and universal catalytic converter?
Direct-fit converters are designed for specific vehicles with factory-style flanges, hangers, and O2 sensor bungs - they bolt directly in place. Universal converters are generic units that require welding and fabrication to install. Direct-fit costs more but installs easier; universal is cheaper but requires exhaust shop work.
How do I know if I need a CARB or EPA catalytic converter?
CARB-compliant converters are required in California and states that follow California emissions: CO, CT, DE, ME, MD, MA, NJ, NM, NY, OR, PA, RI, VT, WA. EPA-certified converters are legal in all other states. CARB converters have stricter precious metal requirements and cost more. Check your state regulations before purchasing.
How do I know if my catalytic converter is failing?
Common signs: check engine light with P0420/P0430 codes, sulfur smell from exhaust, reduced power and acceleration, rattling noise from the converter, and failed emissions testing. These indicate the catalyst material is degraded or the substrate is damaged. Have it diagnosed to confirm before replacing.
Will a high-flow catalytic converter pass emissions?
Quality high-flow cats with proper precious metal loading will pass emissions tests - they're designed to meet the same standards as regular converters while flowing better. Look for EPA or CARB certification. Very cheap 'high flow' cats may have insufficient catalyst material and fail testing. Stick with reputable brands.
How can I prevent catalytic converter theft?
Install a catalytic converter shield or cage - these bolt-on guards make theft much more difficult and time-consuming. We carry these in our Accessories collection. Other deterrents include parking in well-lit areas, installing a car alarm with tilt sensors, and etching your VIN on the converter for tracking if stolen.
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