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Catless downpipe vs catted: Vorsprung catless downpipe for Audi SQ7, SQ8 and RSQ8 EA825 4.0T

Catless vs Catted

Catless Downpipe vs Catted: Power, Sound, Smell, CEL and Resale

Six rounds, two contenders. We put catless and catted downpipes head to head on power,...

Audi 3.0T supercharged HEH headers, the header-back equivalent of a turbo back exhaust

Audi 3.0T

What Is a Turbo Back Exhaust? Turbo-Back vs Cat-Back vs Downpipe on Audis

What is a turbo back exhaust, and how is it different from a cat-back or...

Vorsprung HEH Headers V2 for Audi B8 and B8.5 S4 3.0T supercharged, not an A4 2.0T downpipe

Audi A4

Audi A4 Downpipe Guide: 2.0T Facts and Why the S4 Shops Differently

Every US-market B8, B8.5 and B9 A4 runs the 2.0T four-cylinder, and its downpipe is...