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4L60E & 4L80E Plug & Play Transmission Control

The versatile MicroSquirt can control 4L60E & 4L80E transmissions with just a few clicks!  No wiring necessary.

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MS3-Pro LSX Engine Plug and Plug Drop-on Harness

New LSX Plug and Play Drop On Harness for MS3Pro

Available NOW with EV1, EV6 and Multec (truck) injector connectors!

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MS3-Pro-Standalone-EFI-EMS

MS3-Pro is redefining state of the art in engine & powertrain control!

Experience for yourself why more and more competitors are recognizing and choosing MS3-Pro over the competition.

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DIYAutoTune-MS3-Pro-Landspeed-2JZ-Car

217.3913mph record powered by MS3-Pro!

Jerry Hoffmann achieves a new personal best and sets multiple new records at Ohio Mile with his DIYAutoTune.com / MS3-Pro EMS powered Nissan 240sx.

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Who is DIYAutoTune?

We are Your One-Stop DIY EFI Shop!

MegaSquirt Electronic Fuel Injection Systems, Wideband O2 Sensor Systems, Wiring Harnesses and more...

Based in Suwanee, GA (near Atlanta) we are the primary manufacturer and distributor of the MegaSquirt line of EMS/EFI Systems. Made right here at our facility in the USA. In short, we offer you an affordable way to run your race car on a fully programmable fuel injection and ignition controller, with plenty of high end features such as progressive nitrous control, boost control, 3 step rev limiters, electronic fan control, and spare outputs to control just about anything!
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