It should be more efficient if you inject the lpg with a gasoline injector.
After the intercooler could be a good spot because the heat would have been expelled by the intercooler and the phase change of the lpg will have the most cooling effect.
PS it was me fiddling with steam injection but i sold the car before the implementation. I have a lot of data on my thread. The grand idea was use steam as a warm air intake by controlling the amount with an injector. One would obtain maximum atomization (minimum water droplet size ) in the process. And the setup is relatively simple.
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