Mac BMW 2 Into 1 Exhaust System 1970 To 1984 Chrome R100 R75 R90 R 80 90s. Condition is New in the box. Only removed for pics. I don't think Mac makes this system any longer but I could be wrong. These are new old stock that I've had on the shelf. It says that it works with any 1970 to 1984 BMW r bike. I'm not positive whether or not it'll work with all oil cooler fittings or not. Please try to do your research or ask me questions that I may be able to answer. Thank you