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CARB or EPA – Which Catalytic Converter is Correct?
Most people assume that CARB-approved cats are needed for all California emissions vehicles and EPA cats are needed for all federal emission vehicles – is that correct?
Here's what was found
AP Emissions
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How a Catalytic Converter Is Manufactured
We know what comes out of catalytic converters – cleaner air – but what goes INTO them? Learn how they’re made.
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Manufacturing Heavy-Duty and Industrial Products
The heavy-duty market is exceptionally important – and incredibly diverse and demanding.
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AP Integrates Design and Manufacturing Engineering With Machine and Tooling Expertise
AP employs advanced automation, robotics and computer controlled monitoring as part of its quality and production management systems.
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Every Vehicle Has Specific Needs; Custom Fixtures Create Accurate Exhaust Components
Proprietary fixtures serve as the quality control template throughout the production process.
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At AP, Everything Starts With Steel
On an average day, AP processes over 125,000 feet of finished tubing for creating exhaust components.
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AP Emissions is Committed to Quality, Coverage and Delivery
AP Exhaust has been in the marketplace since 1927, and today has hundreds of employees working as hard as they possibly can to produce the best quality parts to deliver on time.
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How To Make a Muffler That Meets OEM Standards
AP offers customers muffler design options for virtually any vehicular application in form, fit and function.
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How Is A Quality DPF Made (And More Importantly, How Does It Work)? 
Durafit utilizes its own coating designs, state-of-the-art coating process, steel processing, canning, and welding.
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News Flash – Not All Diesel Particulate Filters Are The Same
Designers of diesel aftertreatment systems continue to focus on ways to improve the performance of these systems.