Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
Downpipe Kit with HJS-ECE-300CPSI Racing catalyst for BMW M140(x)i 340i 440i & 540i
made out of high quality stainless steel 1.4301 (SS304)
complete Ø3,5 and adapter for stock exhaust
HJS (ECE approval) 300CPSI EU6 Racing Metal Catalytic Converter
100% perfect fit, replace OEM
less thermal load on the turbocharger
more power by reducing back pressure
significantly more torque
Only suitable for cars without GPF!