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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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Audi 3.0T supercharged high flow cats compared with test pipes for S4, S5, Q5 and SQ5
Audi 3.0T

Test Pipes vs High Flow Cats: Which One Fits Your Audi 3.0T or 4.0T?

Test pipes or high flow cats? This decision guide compares flow, sound, smell, check engine...
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Catalytic converter for Audi 3.0T supercharged: Vorsprung high flow cats for B8 S4, S5, Q5, SQ5 and C7 A6, A7
Audi 3.0T

Catalytic Converter for Audi: Replace, Upgrade, or Go High Flow?

Replace or upgrade? Our catalytic converter for Audi buyer's guide covers failing-cat symptoms, OEM vs...
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