2015 Subaru WRX STI Engine Wiring Harness - Subaru Parts Parts found for 2015 Subaru WRX STI > Engine Electrical Parts > Engine Wiring Harness. 3 illustrations found for the vehicle you selected. Select your vehicle options to narrow down results. Select an illustration to view its particular parts. 1. ENGINE WIRING HARNESS '15MY-'16MY. 2. BAND CLIP. 3. ENGINE WIRING HARNESS. 2015 Subaru WRX OE Wiring Harnesses & Stereo Adapters wwwd››Subaru›WRXSubaru WRX / WRX STI 2015, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.