Hey Twinz, thanks for the info once gain. Your knowledge & experience is legendary!
On the fire extinguisher question, well if you mix with water I don't think there will be any problem. Running 100% meth might be an issue as our late, great connection Devash experienced.
A 335 recently burnt down after coming in for injector recall & BMW released the car without tightening the injectors properly. So obviously the injector got loose & sprayed fuel at very high pressure into the engine bay.
This car had software a long time back but was stock for the last 9 months. No software, no downpipe, nothing. And it never at any stage had water injection, ever. Bone stock for last 9 months, goes into BMW & they messed it up.
So yeah, shit happens, take care of your rides.