The Invidia downpipe with high-flow catalytic converter is made for 2013-on Ford Focus ST applications, replacing the factory downpipe to provide a less restrictive exhaust path. Offered as a direct-replacement downpipe with an integrated high-flow cat, it supports aftermarket exhaust systems where higher flow is desired; confirm fitment for your model year.
Invidia 13+ Ford Focus ST Down Pipe w/ High Flow Cat