AS Performance de-cat downpipe for Focus ST 250 Piper diaphragm-type valve - a type

diaphragm-type valve - a type of valve that has a track record of failures

Install video:

Install Instructions

The materials and processing are closely monitored for optimum performance

Mechanical Data…

AS Performance de-cat downpipe for Focus ST 250 Piper diaphragm-type valve - a typeAS Performance downpipe de cat for Focus MK3 ST250 The Original Catalyst and down pipe , unlike the older ST225 and Focus RS mk2, are made in one piece. This new design features some restrictive bends and an exit bore size of only 55mm. With a new bore size of 70mm the new AS performance Replacement Down Pipe has over 50% more capacity. This part is sold for motorsport and off road use only and will NOT be able to pass a UK MOT emissions test or