This BMW 540i performance exhaust is made in 3.5"/88.9mm pipework and fits from the turbo to the centre exhaust to replace the standard catalyst.
The sports cat exhaust will enable you to pass a UK MOT emissions test or police road side checks.
All relevant fittings and gaskets are supplied.
EML lights may activate after removing the standard O/E catalyst. An ECU Re-map is recommended to correct this problem and stabilise all power increases.