Exhaust Systems Home / Shop / Focus / MK4 Focus ST / Exhaust Systems Sort By Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A Showing products 1 to 7 of 7 Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A Ford Focus ST (Mk4) Front Downpipe Sports Cat / De-Cat Performance Exhaust From: £349.95 Ford Focus ST (Mk4) GPF / PPF Delete From: £139.95 Ford Focus ST (Mk4) GPF-Back Performance Exhaust From: £849.95 Ford Focus ST (Mk4) Venom GPF-Back Performance Exhaust From: £749.95 Mk4 Focus ST GPF Delete £128.95 MK4 Focus ST Non-Resonated GPF delete £114.95 Scorpion Exhausts - MK4 Focus ST 2.3 - GPF Back Exhaust £745.00