chased up my new apex catalogue, and yep no n1 duals sorry. dd is similar to the dual n1.
japlish from trust site. DD you aim toward the substantial improvement of Muffler * dd muffler exhaust efficiency and 90 φ, the large aperture pipe 102 φ dual conversion, guaranteeing many exhaust flows. In addition in order that it corresponds to the sport scene of circuit travelling and drift travelling etc., the silencer - is not the tail and guaranteeing the road clearance of arrangement and the machine rear section to the center section immediately after the catalyst. The silencer to the roadspace (90mm) guaranty tail pipe of safety standards - with installing, safety standards (below approach noise 103db) the guaranty tail silencer - the attachment