CTS Turbo N55 Catless Downpipe (MWG)
To remove the CEL that will occur, proper tuning software must be used. CTS Turbo recommends choosing a High Flow Cat for the sake of our environment!
Use of stage 2 software upgrade is strongly recommended.
Download the installation guide here.
F30 BMW 335i & 335xi 2012 - 07/2013
F20/F21 BMW M135i & M135xi 2012 - 07/2013
135i or 335i with a production date after 07/2013 will need the 4" downpipe: Here