12200411 PCM (24x or 4x)
2001-2002 GM PCM. Requires an EFI 24x™ SBC conversion for coil per cylinder ignition or EFI 4x™ SBC conversion for single coil and distributor ignition. Supports 4L60E, 4L80E, and manual transmissions. Supports cruise control for both cable and electronic throttle.
E40 ECM (24x)
2005-2006 GM ECM. Requires an EFI 24x™ SBC Conversion. Electronic throttle and flat response knock sensors required. Supports 4L60E and manual transmissions. Cruise control supported withTrailblazer SS or SSR calibration.
E38 ECM (58x)
2007-Newer GM ECM. Requires an EFI 58x™ SBC Conversion. Electronic throttle and flat response knock sensors required. Supports 4L60E/4L80E, 6L80E/6L90E, and manual transmissions. Cruise control not supported.
E67 ECM (58x)
2007-Newer GM ECM. Requires an EFI 58x™ SBC Conversion. Electronic throttle and flat response knock sensors required. Supports 4L60E/4L80E and 6L80E/6L90E transmissions. Cruise control supported with Trailblazer SS calibration.
1227165 ECM
1986-1989 5.0L & 5.7L Tuned Port Injection (TPI) Systems. Mass Air Flow (MAF) system that uses a MAF sensor for fuel management. Supports 700R4 and manual transmissions. An OBD-I system considered obsolete by many due to limited PROM tuning support.
1227730 ECM
1990-1992 5.0L & 5.7L Tuned Port Injection (TPI) Systems. Speed Density system that uses a MAP sensor for fuel management. Supports 700R4 and manual transmissions. An OBD-I system considered obsolete by many due to limited PROM tuning support.
