MR2 Kswap SW20 wiring service - huxracing We at Hux Racing now offer a harness conversion service for the SW20 '91-'99 MR2 charge $550 for the harness service. We will need the mr2 body harness, k20a2 engine and charge harness, k series ecu e plug, and rsx chassis side c101 plug. The mr2 body harness is the section of harness from the kick panel by lhd drivers feet running all the way to the tail lights. SW20 kswap FAQ - Hux Racing Q. Do you have a plug and play harness for the sw20 k-swap? A. Hux Racing sells a service to blend the MR2 and K20a2 harness. Check our wiring info page. Q. What ECU can I use.? A1. Hondata-probably the first choice if using the Honda trans since you will be able to use the honda speed sensor for launch control and boost by gear.