Subaru''s unique exhaust sound has been fondly called "boxer sound" by many Subaru owners for many years.
Recent Subaru mainly utilizes an equal length and 4-2-1 exhaust manifold to maximize the engine performance. On the other hand, "boxer sound" is now disappearing. BRZ, of course, utilizes an equal length and 4-2-1 exhaust manifold for the best engine performance
Does creating Subaru "boxer sound" spoil the engine performance? To answer this question, HKS conducted various tests and verified the results. As a result, unequal length 4-1 exhaust manifold was developed, and reproduction of “boxer sound” and engine output improvement were achieved together
The main features of this product are the optimized bank pipe diameter for the right and left sides and vehicle specific catalyzer to manage both the exhaust gas and engine output. This product promises to be an exquisite piece for "Subarists" who know the exhaust sound to enjoy. The durability of this product was tested to guarantee it
Enjoy the unique boxer sound from the horizontally opposed engine.
HKS
In October 1973, two talented and spirited young engineers had a vision; to design and build high performance engines and components that major OE manufacturers could not or would not produce.Led by Hiroyuki Hasegawa, a former engineer for Yamaha Motor Company, and his partner Goichi Kitagawa, the two secured a capital infusion from Sigma Automotive Co., Ltd. (hence the name “HKS ”), and began tuning gasoline powered engines in a dairy-farming shed at the foot of Mount Fuji in Japan. A year later, Mr. Hasegawa designed and built the first aftermarket turbocharger for passenger cars and has never looked back.
HKS pioneered the Japanese aftermarket performance industry by delivering a host of exciting new products, including the first commercially available electronic turbo timer and boost controller. Other early products included piggy-back fuel computers and sophisticated fuel management tools. Clearly HKS was Driving Performance trends for Japanese vehicles.
