I have a fmax kit for my 97 ls and we installed the kit without the big head gasket and it ran good for about 15 min then huge amounts of white smoke came out everywhere. So we figured it was the head gasket, so we installed the head gasket, new water pump, timing belt,plugs, wires..... the battery was dead so we charged it with my buddy's civic still would kick over, so we did the timing belt over again the car started smoke still everywhere and we went to give some gas and the car just shut off like someone took the key out and it won't start what is going on here this sux..... i don't think its the head gasket!

 

how many miles on the LS?

 

As for the white smoke? i would think the obvious first coolant or head related also if you overfuel the engine or are running extremely to rich you can see white smoke this is when you run so much fuel your engine cannot even come close to burning any of the fuel you put in it and this happened to me.

I solved my problem by changing from a 12:1 disc in my fmu to a 10:1 and my fuel pressure regulator was tee'd in with the vac line to the evac (not where its suppossed to be)

*start with the small things first are you by-passing the map sens. with check valves or something else to divert boost and does your fuel pressure reg. have direct vac from the manifold?