The RSX has more in it than the factory ECU was ever going to release.
The Acura RSX and its platform-mates share a factory ECU that prioritizes emissions and averaged-out reliability over what the engine can actually do. The Tuned By Shawn PNP Wiring Harness Kit for the Haltech Nexus connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.
Advantages
- Throttle response that's direct and immediate, not filtered through conservative factory mapping
- Fuel and ignition timing calibrated precisely to your actual setup
- Consistent power delivery that doesn't change with heat or temperature
- Idle stability that's locked in regardless of ambient temperature
- A tune that actually reflects your build and your intentions for the car
Features
- Plug-and-play fitment for 2001-2005 Acura RSX, manual transmission
- Compatible with Haltech Nexus R3, R5, S2, and S3 ECUs
- No cutting or splicing of factory wiring
- OEM-quality connectors, USA-built by Boomslang Fabrication
- Fully reversible, factory harness preserved
- For competition and off-road use
The Details
Built specifically for this vehicle's connector layout with OEM-spec connectors and correct wire gauge throughout. Your factory harness stays completely untouched and the car can return to stock at any time. The Haltech Nexus takes full engine control once installed, giving your tuner a clean vehicle-specific foundation to build a proper map from.
Kit Includes
- 1x Boomslang PNP wiring harness for 2001-2005 Acura RSX
- Haltech Nexus ECU sold separately
Fitment
2001-2005 Acura RSX / 2001-2005 Honda Civic, Manual Transmission.