In our November 2nd 2025 Forum Build Thread update for Agent 86 – our 2013 FRS we bought in 2016 – we talked about a V6 swap using a Honda 3.7L SOHC V6 used almost exclusively in FWD platforms. SCCA Time Attack class rules + the low weight of this vs the VQ, 2GR, and other DOHC V6s pushed us to the Honda 3.7L V6. We picked a late RX8 6-speed transmission and decided to see if we could make this all work.
The latest Forum Build Thread update from April 14, 2026 shows how we got from the concept and early stages to this running, driving, and now dyno tuned setup. The forum post covers work through about mid-March, but even still it is a massive 5 part update covering a LOT of tasks in detail.
This Forum Update covers engine mounts, transmission crossmember, driveshaft, exhaust, cooling re-route work, radiator hoses and remote reservoir, NOCO NLP30 battery install, fuel tank work, plumbing for fuel and oil systems, adding an oil cooler and remote filter, and much more.
There is a lot more tech in this forum post than you can ever hope to see in any youtube video, and we likely spent 30+ hours writing, editing, photographing this work so if you have the time, and a larger screen to view this on, you can start catching up here. Every photo is clickable for higher rez versions or videos. Thanks for reading!