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Audi exhaust system high flow catalytic converters for B8 B8.5 S4 S5 Q5 SQ5 3.0T supercharged
Audi A4

Audi A4 Exhaust System: Upgrade Guide by Generation, Sound and Legality

An honest Audi A4 exhaust system guide: how the layout changes from B8 to B9,...
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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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Zeus ignition coil upgrade kit for the Audi B9 S4 EA839 3.0T turbo, a supporting mod for exhaust builds
Audi S4 B9

Audi S4 B9 Exhaust Guide: Options, Sound and the Upgrades That Matter

Shopping for an Audi S4 B9 exhaust? Here is how the EA839 exhaust is laid...
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