The only useful goal for our M3 guts system is to transport cooling water. Despite it’s hot, we have chosen for blue. The silicon tubes are all standard parts, which means a lot of connectors and clamps.
It’s a pity but a custom setup, with preformed shapes would be too expensive.
Maybe if you all going to copy our setup it could be feasible to make dedicated 1 piece tubes.
Anyway, the coolant fluid can go on the engine, and as you know water is the start of everything !!