STM Speed Density Sensor Kit GM AIT & 4 Bar MAP for Evo 8/9 & DSM

The STM GM Speed Density Sensor Kit is a complete sensor package designed for Mitsubishi Lancer Evolution VIII/IX and DSM applications being converted from the factory MAF system to Speed Density engine management. The kit combines a GM Air Intake Temperature (AIT) sensor, 4-bar Omni Power MAP sensor, matching wiring harness, and an aluminum weld-in bung for a clean and reliable installation.

Speed Density uses MAP pressure and intake-air temperature data to help the ECU calculate engine airflow, making this kit a useful upgrade for high-performance Evo and DSM builds where the factory MAF setup may become a limitation.

Product Details

• Brand: STM
• Product: GM Speed Density Sensor Kit
• STM SKU: STMKIT-EVO89-DSM-SDSK-GM
• MAP Sensor: Omni Power 4-Bar MAP
• AIT Sensor: GM AIT Sensor, part #25036751
• Harness: STM GM AIT Pigtail Harness
• Weld Bung: STM aluminum 3/8″ NPT
• Application: Speed Density conversion
• Fitment: 2003–2006 Mitsubishi Evolution VIII & IX
• DSM Fitment: 1990–1999 Eclipse GST/GSX, 1990–1998 Talon TSi, and 1990–1994 Laser RS

What’s Included

1. STM Aluminum 3/8″ NPT Weld Bung
2. Omni Power 4-Bar MAP Sensor
3. GM AIT Sensor
4. STM Pigtail Harness

Key Benefits

• Complete Speed Density sensor package
• 4-bar MAP sensor suitable for high-boost applications
• Accurate intake-air temperature monitoring
• Includes matching AIT wiring harness
• Aluminum weld bung allows installation directly into the intercooler piping
• Excellent solution for Evo 8/9 and DSM performance builds
• More affordable alternative to STM’s AEM-based Speed Density kit

Note: Converting to Speed Density requires appropriate ECU support, wiring, and calibration/tuning. Verify your ECU and engine-management setup before installation.

Current listed price: $158.00 USD from STM.