Exhaust & Emissions

Getting gas out of the engine, and getting the car through its emissions test.

8 guides

• A Brief Overview of Cat-Back Exhaust Makers

  5 min

• Everything You Need to Know About a Catalytic Converter

  5 min

• How to Clean the Catalytic Converter

  5 min

• How to Clean the EGR Valve Correctly

  4 min

• How to Replace a Secondary Air Injection Pump

  5 min

• Performance Exhaust 101: Info, Tips and Options

  4 min

• The Smog Test: When, Why and How

  5 min

• Top Audi S4 Exhausts for Your B8

  7 min · Audi