The Haltech Nexus plug-in ECU drops straight into the Mazda RX-8's factory ECU location and plugs into the OEM harness, retaining factory functions while adding full standalone tuning — O2 control, flex fuel, boost/launch/nitrous control and up to 128MB logging.
 
Fitment: Mazda RX-8 Series 1 (2003-2008), 13B-MSP Renesis  6-port (ADM/USDM/JDM/EUDM) and 4-port (JDM). Manual transmission only (5-speed on 4-port, 6-speed on 6-port).
 
In the kit:
Nexus plug-in RX-8 ECU
Air-temperature + wideband expansion harness (2.5m / 8ft)
Air-temperature sensor (1/8" NPT) with alloy bung
Mounting brackets and hardware
3mm vacuum hose (2.5m / 8ft) with alloy T-piece
Haltech USB-C cable and quick-start guide
 
Key features:
Drive-by-wire throttle support
Single-channel onboard wideband (LSU4.9 / NTK)
Wi-Fi connectivity with smartphone app
4-channel onboard oscilloscope, 128MB logging
Knock control and closed-loop O2
Aux connector: 4 digital outputs, 4 pulsed inputs
 
Please note: Complete plug-in ECU. Manual transmission only.
Genuine Haltech. Part #HT-231401.