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High flow catalytic converter downpipe for Audi 4M SQ7, SQ8 and RSQ8 4.0T V8
Audi 3.0T

Are High Flow Catalytic Converters Legal? EPA, CARB and Inspection Rules

Are high flow catalytic converters legal? It depends on federal rules, your state, the exact...
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Catless test pipe style downpipe for Audi 4.0T SQ7, SQ8 and RSQ8, illustrating catalytic converter test pipes
Audi 3.0T

Catalytic Converter Test Pipes: What They Are, Risks and Who They Suit

Catalytic converter test pipes replace your cats with open tube. Here is what that really...
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