About Us

Doryoku

Japanese noun meaning "effort," "endeavor," "hard work," or "exertion." It signifies a dedicated, consistent, and often arduous striving towards a specific goal, both in personal improvement and professional tasks. It is comprised of the kanji for "strive" (努) and "power"

Doryoku Parts 

Speciality parts designed for track car optimization. We are always chasing that 1% gain in every part of the car because it’s the sum of all parts that results in maximum performance from our innovative tubular bumper bars, suspension arms, to billet hubs.

Doryoku Valve covers

Engine valve cover is the single item in the engine bay that sets the tone of the car, completes the look & communicates what type of builder you are. We have been the leader, innovator in custom Honda valve covers.  From restoration builders looking to freshen up their engine bay, to car show builders chasing that best in show trophy,  to pure track cars (road race, time attack, drag race) who want the best CNC cover baffles, custom fabrication to integrate with their catchcan, ignition coils.

Doryoku R&D

We are racers, car builders, engineers, fabricators & grassroots motorsports enthusiasts. Research and development is our favorite part of the process in parts manufacturing. It’s not good enough just to model it on a computer, we track torture test our parts to ensure our clients get our best. Even when revisions aren't needed we compete against ourselves to find improvements. When you become a client of Doryoku, you are supporting a high moral code of ethics in parts development & trusting in the designed philosophy of use behind all our products.