Dude... I'm not droppping shit on you or your thread ok..... so please don't take offence.
Take a better look at your exhaust to look for any other markings or stamping on it. JASMA is not really a brand name. JASMA is the governing body in Japan for aftermarket exhausts. For aftermarket exhausts to be "STREET LEGAL" in Japan they must be approved by JASMA. To be approved by JASMA they must pass such things as, DON'T QUOTE ME, but things like dB Limit, ground clearance, and maintain within the emmision laws that where imposed on said vehicle on that year of production.