Felt the excellent F3 classic formula Junior DKW Mitter (Miker) needed some 2 stroke smoke for some more immersion.
Quick and dirty edit I made using Fuzo's trabant as a starting point, but copy this into extension folder for effect.
[PARTICLES_FX_EXHAUST_...]
POSITION = 0.50, 0.260, -0.330 ; self explanatory
DIRECTION = -1, 0.3, -1 ; self explanatory
COLOR = 0.75,0.8,3 ; RGB blend - 0,0,0 is black, 1,1,1 is white
LIFE = 1, 2 ; how long particles last in the air before disappearing
SPEED = 0.5, 1 ; how fast smoke particles fly from the exhaust
SPREAD = 0.25 ; initial spread of particles
STARTING_SIZE = 0.05 ; initial size of particles
SPAWN_OFFSET = 0.05 ; initial spawn point offset (length-wise)
INTENSITY = 0.35, 0.5 ; smoke intensity
TEMPERATURE_LAG = 1 ; engine heating up (1 to disable)
SPEED_THRESHOLD = 60, 100 ; speed at which the smoke disappears