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O.S. Speed 21XZ-B Spec II, manuals:

The O.S. Speed 21XZ-B Spec II, a high-performance engine, is designed for professional RC car enthusiasts. Equipped with exceptional power and precision, this top-of-the-line engine ensures optimal performance on the track. Enhance your racing experience with step-by-step guidance provided in the free Instruction Manual, available for download exclusively at manualshive.com.