Defn uisng LPG in car won't be a problem.
I have been using LPG Lovoto kit my WagonR 2005 model for more than a year.
I haven't faced any problem till now except the FE
I heard from my installer that if LPG leaks from the tank atonce it fades out in the air.it won't get fire by electrical parts in a car.
So no worry in using LPG.But go for original kit and good installers.