• About Us

    Legacy Performance

    We have been a world leader in replacement ATV

    and UTV engine control units since 2004.

  • Machine Specific Designs

    Machine Specific

    Designs

    Each product is custom engineered

    and dyno tuned to ensure

    it functions properly on

    each specific ATV/UTV.

  • Used Globally

    Global Sales

    You can find our products installed in recreational

    and commercial vehicles worldwide.

  • Four Season Performance

    Four Season Performance

    Our products are designed to operate year

    round to give you maximum enjoyment.

  • Need Help?

    Need Help

    Having an issue and need to know if it's our product or your ATV?

    Simply contact us.  We typically respond to all support requests

    in one business day. 

  • The Copperhead® ECU is a plug and play replacement (not a piggyback solution) for the stock ECU in the Suzuki King Quad 750. It controls the timing and fuel, and our high energy and repetitive fire ignition allows for crisper throttle response, reduced fuel consumption, while giving substantial power gains.  

    USD$451.52
  • The Copperhead® ECU is a plug and play replacement (not a piggyback solution) for the stock ECU in the Yamaha Rhino 700. It controls the timing and fuel, and our high energy and repetitive fire ignition allows for crisper throttle response, reduced fuel consumption, while giving substantial power gains.  

    USD$451.52
  • The Live Tuner is the most advanced engine tuning device available, and is compatible with all Copperhead® ECU (CDI not currently supported). The Live Tuner requires the CopperheadEFI Windows application: COPPERHEAD EFI WINDOWS APPLICATION

    USD$108.36
  • The Copperhead® ECU is a plug and play replacement (not a piggyback solution) for the stock ECU in the Yamaha Grizzly 700. It controls the timing and fuel, and our high energy and repetitive fire ignition allows for crisper throttle response, reduced fuel consumption, while giving substantial power gains.  

    USD$451.52
  • The Copperhead® ECU is a plug and play replacement (not a piggyback solution) for the stock ECU in the Suzuki King Quad 700. It controls the timing and fuel, and our high energy and repetitive fire ignition allows for crisper throttle response, reduced fuel consumption, while giving substantial power gain.  

    USD$453.21
  • The Live Tuner is the most advanced engine tuning device available, and is compatible with all Copperhead® ECU (CDI not currently supported). The Live Tuner requires the CopperheadEFI Windows application: COPPERHEAD EFI WINDOWS APPLICATION

    USD$108.77
  • Pre-pay your service charge fee for repairs and programming.  Return shipping will be automatically added to this item. Please contact us before purchasing this item.  A valid RMA number is required for ALL shipments.  

    USD$18.13
  • The Copperhead® ECU is a plug and play replacement (not a piggyback solution) for the stock ECU in the Suzuki King Quad 750. It controls the timing and fuel, and our high energy and repetitive fire ignition allows for crisper throttle response, reduced fuel consumption, while giving substantial power gains.  

    USD$453.21
  • Your Shipment

    All in stock orders are shipped within 1 business day of cleared payment.  We will provide you with a link to track your package online when it ships.

  • Product Issues

    Customer service is our #1 priority.  We will replace any confirmed defective product in the next business day.

  • Payment Methods

    We accept VISA, MasterCard, AMEX, and PayPal.  

Website Pricing

Orders are invoiced in Canadian dollars, and do not include foreign taxes and duty (where applicable). 

Technical Support