Hartmann GT Downpipes and Cats for Audi B6 and B7 S4

Hartmann GT Downpipes and Cats for Audi B6 and B7 S4 6-speed are a complete 57mm mandrel bent stainless steel downpipe replacement set with Metal matrix high flow catalytic converters. Hartmann exhausts are fully made in the USA and have a lifetime warranty.

Fits Audi B6 and B7 S4 Sedan, Avant and Cabriolet.

We recommend an ECU upgrade designed for use with high flow catalytic converters when using this product as the OEM Audi ECU programming may trigger a catalytic converter efficiency code due to the higher flow rates.