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If it uses a mass airt flow sensor, and you inject it after said sensor, you might be OK, assuming the ECU compensates for it running rich from what the O2 sensors are telling it.
If you add it before said sensor, or if it uses an absolute pressure sensor, the engine will see the gaseous propane as more air and try to add more fuel. O2 sensors/ECU might not be able to compensate enough.
And something to consider...pure propane setups are known to burn exhaust valves...reading up on it, it appears to only be an issue when running rich on propane. You'd be running on the rich side with your setup. Might cause long term issues, if the ecu isn't compensating enough.
Doubt you'd have to worry about things icing up if you were only putting out a low volume (not running on just propane).
You'll want some kind of propane regulator. Like off of a portable BBQ. Or maybe use a plumbing torch head...as a volume restriction rather than pressure restriction. If you were looking to just idle off of it, with an injector kill switch, I might suggest the cheap dual-fuel carbs meant for generators and other such small engines to do the mixing.
Conclusion...start slow, expect to find a limit to the benefit and back off when you hit it. Oh and make sure you have a way of reading and resetting ECU codes.
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