DJN High Quality Exhaust Manifolds Pipe Catalytic Converter for E60 530l 525i 525

Before spending thousands of dollars on a new catalytic converter, make sure you have considered and investigated all other potential sources for your fault codes - oxygen (O2) sensors, cooling system, intake or exhaust leaks, fuel injection, vacuum, secondary air system, and other emissions-related equipment. Returns of this product are limited to quality

Catalytic converters must be matched to the vehicle build specification ，Using a un quality standard cat on a car will result in failure of emissions inspection and possibly even poor drivability, fault codes, and a check engine light for incompatible parts. Your vehicle spec can be found on an emissions label on the underside of your hood. DJN CAT not price maybe not best but have premium catalytic material and a longer warranty.