Holiday Announcement

Yoshimura R&D we will be closed beginning Saturday, December 23, 2023 through Monday, January 1, 2024. We return back to normal operations on Tuesday, January 2, 2024 at 8:00am PST.


12/23/2023 - 12/27/2023 Closed

12/28/2023 Open 10:00am - 4:00pm PST. Shipping all in-stock web orders placed before Noon PST.

12/29/2023 - 1/1/2024 Closed

1/2/2023 Return to Regular Business Hours @ 8:00am PST

Thank you and Have a Wonderful Holidays!

~ From All of Us at Yoshimura R&D

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Race series product restriction and affirmation


The RACE SERIES product you are purchasing removes, renders inoperative, or bypasses required elements of the emission control systems of EPA, certified motorcycles of motorcyle engines and may only be installed on motorcycles that are restricted to closed course competition. Installation of this product on a motorcyle that is ridden on a public street, highway, or public lands violates the tampering and defeat device provisions of the Clean Air Act & 203(a)(3)(A) and/or & 203(a)(3)(B) and may subject you to a civil penalty of up to $37,000.

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Race Information

Rider/Purchaser Information


By clicking below, I affirm:
  1. that i have read the above warning;
  2. that any information I have entered is accurate; and
  3. that any motorcycle on which I install the RACE SERIES product will be restricted to closed course competition and will not be ridden on any public street, highway or public lands.