One of the more creative designs for a an exhaust we’ve seen so far is this new release from HKS is a full 304 grade stainless exhaust. The main pipe section is 85mm in diameter and opens to four 119mm tips at the rear.

While this exhaust manages a huge improvement in flow, careful selection of materials and mufflers keep the noise in check managing to come in only 1dB louder than the standard exhaust.

Part number 31021-AN009, this exhaust will retail for 304,500 yen in Japan.

Images: SHH ProShop Blog via NAGTROC
Source: Ben Linney from GTR23.com