The PRINS system is generally pretty good. I would ask if they can say who installed it, and google them too for piece of mind.
I would certainly consider an LPG installation a plus point rather than a negative. Although I can see why people would think seeing it on an M3 would be not with keeping of the cars intention.
I would certainly consider an LPG installation a plus point rather than a negative. Although I can see why people would think seeing it on an M3 would be not with keeping of the cars intention.