Tenneco Automotive has formed a joint venture with Thai exhaust system manufacturer Yarnapund Co and the new company, Walker Exhaust Thailand Co., will supply systems for the Isuzu I190 platform, a light pickup truck due to go into production next year, AutoAsia Online said. Walker Exhaust Thailand will be located at an existing Yarnapund facility in Bangkok and will assemble exhaust systems using parts both manufactured locally by Yarnapund and imported from Tenneco Automotive factories outside Thailand, AutoAsia Online added.