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Hedman 21107 Header Reducer with Oxygen Sensor Bung


  • Bolts/Studs Included
  • Yes
  • Collector Attachment
  • 3-bolt flange
  • Collector Diameter
  • 3.000 in.
  • Gasket Material
  • Composite
  • Gaskets Included
  • Yes
  • Oxygen Sensor Bung Included
  • Yes
  • Quantity
  • Sold individually.
  • Reducer Finish
  • Natural
  • Reducer Material
  • Steel
  • Reducer Outlet Diameter
  • 2.250 in.

    Summit Racing Part Number: HED-21107


    • Please see the "Compatibility" link at the top of the listing. Fitment information may not be available for all products and those without fitment will not have a Compatibility link.  

    • IMPORTANT - Please be sure to view the "Notes" option for more details if it is available.


    • Please see the "Shipping and Payment" tab or the top of the listing for shipping costs.
    • We ship within 1 business day(s).
    • We do not ship to APO/FPO or Post Office box addresses on eBay.
    • We use UPS and Fedex for most orders.  We are unable to guarantee a specific carrier.
    • In-stock items can ship from three locations - Georgia, Nevada or Ohio. To avoid delays, we ship the order from your nearest stocking warehouse. This means orders may arrive in multiple boxes or at different times.
    • We are unable to accept Summit Racing Gift Certificates or Summit Bucks on eBay.


    • We accept PayPal only on eBay.  We do not accept PayPal E-Checks.
    • PayPal Immediate Payment is required on all listings - please use the eBay cart for multiple purchases
    • All orders ship with an itemized invoice. We are unable to send an order without an invoice.
    • We do charge sales tax in Ohio (6.75%), Nevada (7.725%), Texas (6.25%), and Georgia (7%). State taxes will be calculated at checkout.

    Summit Bucks

    • If this item is noted as earning Summit Bucks, a Summit Bucks Certificate will be mailed to you approximately two weeks after your item has shipped. Summit Bucks are redeemable on your next purchase directly through Summit Racing only. Summit Bucks are not redeemable through eBay. Please contact our Customer Service department with any further questions (800)-517-1035


    • We offer a 90-day Handshake Guarantee. Items may be returned within 90-days of purchase for a refund or exchange, if in new and unused condition.
    • Buyer pays return shipping.

    Customer Support

    • Our customer support is available 24/7. Please contact us at 1-800-230-3030 if you need assistance.