MegaSquirt Engine Management & Fuel Injection by DIYAutoTune.com

Limited Lifetime Warranty on Every MS3Pro Ultimate & EVO Purchase

Perhaps the most valuable standard feature yet!

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Introducing the new MS3Pro EVO Engine Management System

Faster Datalogging, more VR & analog inputs, on-board 4bar MAP and baro… plus so much more!

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MS3Pro Plug & Play for Chevy LSX

Available now for MS3Pro Ultimate & EVO, just choose your injector connectors and get to tuning!

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Get your MS3Pro Apparel Here

Flex your MS3Pro colors! Cotton T’s, curved or flat brim FlexFit hats!

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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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Featured Products View All

MS3Pro ‘Drop On’ 24x LS Plug and Play Harness w/ ECU-EVO
From: $1,749.00
This COMPLETE package includes an MS3Pro EVO ECU and a GM 24X EVO/ULTIMATE Drop On Harness. Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pr...
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MS3Pro ‘Drop On’ 58x LS Plug and Play Harness w/ ECU-EVO
From: $1,749.00
This COMPLETE package includes an MS3Pro EVO ECU and a GM 58X EVO/ULTIMATE Drop On Harness. Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pr...
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MS3Pro Ultimate Standalone Engine Management System
$1,499.00
Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability to MS3Pro's staggering feature set beginning with a new high quality aluminum IP65 rated, water resistant enclosure. The Ultimate provide...
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MS3Pro ULTIMATE Standalone ECU Only
$1,349.00
Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability to MS3Pro's staggering feature set beginning with a new high quality aluminum IP65 rated, water resistant enclosure. The Ultimate provide...
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MS3Pro EVO Standalone Engine Management System
$1,249.00
Introducing MS3Pro EVO. (supersedes 1st Gen MS3Pro) MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ultimate. EVO does not have peak and hold injector drivers, but it d...
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MS3Pro EVO Standalone ECU Only
From: $1,099.00
Introducing MS3Pro EVO. (supersedes 1st Gen MS3Pro) MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ultimate. EVO does not have peak and hold injector drivers, but it d...
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MS3Pro ‘Drop On’ 24x LS Plug and Play Harness w/ ECU-ULTIMATE
From: $2,049.00
This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 24X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...
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MS3Pro ‘Drop On’ 58x LS Plug and Play Harness w/ ECU-ULTIMATE
From: $2,049.00
This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 58X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...
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GM LS 24x Plug and Play Engine Harness-ULTIMATE EVO
From: $799.00
For MS3Pro ULTIMATE/ EVO plug and play installation on GM LS engines with a 24x crank trigger. The MS3-Pro 24x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today. Save your hard earned time and mone...
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MS3Pro ‘Drop On’ 24x LS Plug and Play Harness w/ ECU-1st Gen
From: $1,699.00
For MS3Pro 1st Gen plug and play installation on GM LS engines with a 24x crank trigger. The MS3Pro 24x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today. Save your hard earned time and money whil...
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MS3Pro ‘Drop On’ 58x LS Plug and Play Harness w/ ECU-1st Gen
From: $1,699.00
For MS3Pro 1st Gen plug and play installation on GM LS engines with a 58x crank trigger. The MS3Pro 58x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today. Save your hard earned time and money whil...
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MicroSquirt CAN Transmission Controller with 4L60E Subharness
$499.00
4L60E Plug and Play Transmission Control via MicroSquirt Seamlessly control your 4L60E transmission with MicroSquirt Transmission Control! The supplied 4L60E subharness provides a simple, plug and play integration with MS3-Pro and directly mates with...
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