OEM Catalysts are commonly very dense and restrictive on gas-flow. These pipes de-restrict the air-flow, allowing for a louder experience and improved performance.
| Vehicle | Chassis | Years | Engine |
|---|---|---|---|
| AudiS8Audi > S8 > D4 4.0 TFSI quattro Tiptronic > 2013 to 2018 | D4 | 2013–2018 | D4 4.0 TFSI quattro Tiptronic |