I installed my MEG which includes the effects of racerboy for gwx2.1, then I installed the Urfischs_ModStrike_Beta1, but to keep the fumes of ships with damage , I have wiped out his particles.dat. and I left particles.dat of rb.
by this way now i have a mix of effects:fume's rb , urfish's explosion , but I get this strange effect.
the version of rb-effect that i use is not the last because i know that it is compatible with gwx2.1 but not with gwx3.0 my version is Rbs_SH4_effects_204f1
My wish : would be to import in the particles.dat of urfish-mod, the same smoke that is in meg and that you can see in the screenshoot ( i like more the rb-smoke without wind effect ) but I don't know the way to import and if that is possible 
I don't use gwx3.0
thank mates for help me!!