http://www.5zigen.co.jp/

5ZIGEN International Inc. (Gojigen International, UK: 5ZIGEN INTERNATIONAL INC.) is an automobile parts manufacturer headquartered in Yao, Osaka. It mainly manufactures and sells mufflers and aluminum wheels.
Established in February 1987 in Higashi-Osaka, Osaka as Dijon Cars Co., Ltd. It is one of the leading automobile muffler manufacturers in Japan, and is known by the name "5ZIGEN" (5D), its main brand rather than the company name. When the brand was used, the kanji notation “five dimensions” was also used, but later it was unified to “five dimensions” and “5ZIGEN”.