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58mm Throttle Body/ Velocity Stacks is a must have if you have head work, high performance cams, or going big bore motor.


  • Each throttle body solid shaft is handmade from stressproof steel on a Hurco CNC and Monarch toolroom lathe.
  • Once completed it is fitted with our machined stainless steel blades and then screwed together.
  • Choose to have us re-manufacture your already 58mm HD Destroyer throttle body and OR machine your 53mm or stock system to 58mm which includes both plastic velocity stacks.
  • This service does require your unit shipped for exchange/ service rendered. DON'T forget to mail in your velocity stacks. 
  • BONUS!

    Core set is required or for an additional $200 you can keep your stock handlebar.

  • Return and Refund Policy

    • Returns are expected and full refunds are given as long as the item or items have not been used or installed in any shape and or form.
    • Partial refunds maybe given for used or installed items but you will need to communicate with Fitzgerald Motorsports before sending any items back to Greenville, Ohio. Buyer pays shipping back.
    • Fitzgerald Motorsports reserves the right to deny any refund of any nature at any time.
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