I found this in my PLR file:
Nothing like the "New Years Eve" fireworks of rFactor, just some small sparks here and there. Very nice edition to the immersion factor
I changed it to "1" and now I get some very nice and realistic looking sparks when vehicles trade paint.Vehicle Sparks="0" // Whether sparks occur from vehicle-to-vehicle collisions
Nothing like the "New Years Eve" fireworks of rFactor, just some small sparks here and there. Very nice edition to the immersion factor