Made in the USA | Home of AMP EFI, MaxSpark, and Digital Dash EFI

Since 2004, DIYAutoTune.com has been the trusted source for standalone engine management systems, EFI wiring solutions, and MegaSquirt ECU tuning support. We proudly design and manufacture all of our in-house brands — AMP EFI, MaxSpark Ignition, and Digital Dash EFI — at our facility in Gainesville, Georgia, USA.

Whether you're tuning a street build, race car, or custom swap, our products give you full control over your engine's performance. From plug-and-play EFI harnesses to programmable ECUs, we offer complete solutions that are beginner-friendly yet powerful enough for professional tuners.

We’re also a leading supplier of the original MegaSquirt ECU line, with both assembled units and DIY kits, supporting a wide range of import and domestic vehicles. In addition to our own brands, we partner with trusted performance companies like 14point7, Innovate Motorsports, and Low Doller Motorsports to bring you the best in wideband O2 sensors, accessories, and tuning tools.

Why DIYAutoTune?

• Quality EFI systems built in-house for reliability and performance
  
• Specializing in AMP, MS3Pro, and MegaSquirt
  
• PNP EFI Harnesses for modern engine platforms
  
• Orders ship fast when placed before 12PM ET
  
• Real help from real EFI experts, not a call center