Ordered 6mm thick SiO2 Silica oxide aerogel sheet to wrap downpipe. It’s classed as incombustible, good for 800c and at 10mm thickness can reduce 650c on one side down to 50c on the other. its hydrophobic so won’t absorb liquid and chemical resistant as well.   Then going to them wrap the aerogel in common adhesive glass-fibre cloth with alloy so it has abrasion resistance.   The exhaust is already ceramic coated but it’s still getting too hot near the steering rack and both the brake and clutch master cylinders.  

Holden astra and most ev cars have similar pump and tank in one units as well.    edit.. plus  Audi Seat Skoda Volkswagen POLO FOX LUPO  like 6Q0423155AE 6Q0423155AB 6Q0423156E

That mopar way seems like a heap more effort. The Volvo should be just a matter of new supply and return lines then power. Some people even run it with no signal stuff working so it goes into a sort of limp mode and just runs a fixed percentage assist, something like 60-70%   It would be interesting to see real world amp draws on the Volvo, I’d assume it’s usually quite low and only sees anything particularly high during full lock at crawling speeds where there’s probably enough grunt in the battery to negate the shortcoming for short bursts. 

seems s209 uses the auto paddles as water spray which is what I had planned. https://techinfo.subaru.com/stis/doc/ownerManual/MSA5M1923K_STIS.pdf

Seems they are also in Hyundai cars as well so more options in NZ wreckers. but the later 2019 units had recalls  https://static.nhtsa.gov/odi/rcl/2019/RCRIT-19V812-3365.pdf   https://epasperformance.com/products/mopar-a-body This was similar to what I initially thought, use steering angle sensor as input. The greater the rate of change the more assist. Also says only 10 amp average during use so could get away without new alternator.