Some vehicles sport two catalysts due to their dual pipe assembly. The Secondary Catalyst Bypass pipe removes the secondary catalysst to further improve gas-flow and reduce the restrictions caused by catalysts within the exhaust system.
| Vehicle | Chassis | Years | Engine |
|---|---|---|---|
| AudiRS3Audi > RS3 > Sportback S tronic (8P) > 2011 to 2012 | 8P | 2011–2012 | Sportback S tronic (8P) |
| AudiTT Mk2Audi > TT Mk2 > TT RS Coupé 2.5-litre TFSI quattro > 2009 to 2014 | — | 2009–2014 | TT RS Coupé 2.5-litre TFSI quattro |
| AudiTT Mk2Audi > TT Mk2 > TT RS Roadster 2.5-litre TFSI quattro > 2009 to 2014 | — | 2009–2014 | TT RS Roadster 2.5-litre TFSI quattro |