This Subaru BRZ performance exhaust is 2.5"/63.5mm pipework and fits from the catalytic converter section backwards (Cat-back) these parts replace the centre and rear sections.
The resonated exhaust includes the centre silencer and has a subtle but sporty tone. This exhaust however, is also available as a non-resonated version which is a louder option, as it excludes the centre silencer and therefore, has a sportier exhaust note.