I replaced my left and right catalytic converter on my 1997 BMW 540ia and kept the old ones to obtain scrap pricing. Each are OEM. One weighs 10lbs and the other weighs 10.5lbs. One is 24in and the other is 26in.
Cat 1 is engraved with:
BMW Logo
1715561
1715562 E 0019
Boysen 5122.40/41 07/01...