At Williams we have spent alot of time developing ecu map and throttle body kit for the Sigma engine.
We have almost completed a Sigma induction kit with ITG.
We have also developed a full exhaust system.
We can also offer engine builds
This is the well proven engine we built fot Henry to use in the Morgan Aero Challenge.
https://www.youtube.com/watch?v=iCtrEFmTAJsEmail or message me for ideas and costings.