Most of the time iWire recommends using the OEM ECU that is designed for the engine that is in the car. However, there are circumstances where a standalone can be the right choice. Please note that we only sell Haltech products with a merge or swap.
The Haltech ECU is a great option for:
1993-2000 JDM WRX or STi (OEM ECU is non tunable) - Plug and Play Harness Available
Six Cylinder Applications (OEM ECU is non tunable)
CANBUS equipped 2008 and newer WRX and STi in non CAN equipped chassis
CANBUS equipped 2005 and newer Legacy GT in non CAN equipped chassis
Coming Soon! Haltech Elite 2500s will be plug and play replacements for 08-14 Controller Area Network (CAN) equipped Impreza WRX and STi. Normally for these applications the standalone ECU would have to be run as a piggyback to the OEM ECU in order to keep the dash equipment happy like cluster, radio, ABS, etc.