The official Yoshimura distributor for Thailand is the Dirtshop in Bangkok. But I don’t think that they sell the Yoshimura exhaust for the Honda Wave 125...
What I can remember, it was a special promotion by the Malaysian distributor of Yoshimura. I’m not even sure if the Malaysian company is still a Yoshimura distributor.
So you best try to contact the official Thai distributor:
Dirtshop Thailand
email: dirtshop@dirtshopthailand.com
Tel. : 02-322-1441
Anybody who now were to buy a Yoshimura exhaust for a Honda Wave 125i.I stay in Bung khan northeast of Thailand I will also come to Pathum thani Rangsit in December.