'nuther exhaust option

Anybody know anything about these?
exactrep.com/acatalog/Kawasaki2.html

If those are Marving's, then they are not well known in the USA, a bit better known in Canada and well known in the UK and perhaps Australia. IIRC, they have a good reputation.

Not well known here in Canada either

Yup,Marving.This is what Wemoto have to say;

MARVING The Company
Marving, founded in 1969 Torino Italy, where among the first Italian companies to produce 4 into 1 complete system for maxi bikes, imposing itself soon on the world market. Today as 30 years ago Marving technicians and workers devote themselves to create high quality performing products, offering an efficient customer service. The entire production cycle is carried out inside the factory, from the raw material to the final item in order to keep a constant control on the quality issues. After the project and prototyping every single exhaust system is dyno tested before being assembled by T.I.G. and M.I.G. welding and series produced.
The quality of every item is accurately checked step after step, from the riveting and cleaning to the final packing. A CNC milling machine allows them to produce internally all the moulds needed and a high precision cnc bending machine creates bends with no defects.The passion and care for details together with a constant update with new technologies make Marving exhaust systems unique. To satisfy the needs of the two wheels enthusiasts is Marving ultimate aim, offering one of the most complete range on the market on vintage and new generation bikes, because choosing Marving means owing a product designed with care, easy to fit, and is 100% Italian.