What happens fitting a turbo downpipe that replaces the OEM particulate filter on a diesel car?
Diesel cars have been the object of a lot of modifications in recent times to match the increasingly restrictive emission regulations. In this specific case the particulate filter, added to the catalytic converter, has become a restriction to the engine performance.
Fitting a turbo downpipe without any filter let the exhaust gasses flow better, resulting in a higher turbo and engine efficiency.
Most of the cars gain from this modification, but it’s important to work on the ECU as well, to adjust the engine management and deactivate the particulate filter functions, that may provoke errors and malfunctions.
In many countries the removal of the DPF is illegal on open roads, so the Supersprint diesel downpipes must be considered for race use only.