Really the "safest" way to do it is a propane system run to your exhaust tips. At least safest for the operation of the Bronco.
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Close...People have been doing it since at least the '50's by installing a spark plug in the exhaust and running the carb rich.
I was with my mate yesterday and he was telling me how he tuned his Nissan Z to spit flames and that gave me a really bad idea or a really cool idea. Don’t think a bronco could be tuned to spit flames? (Obviously swap out the exhaust and all that good jazz) But would you be able to tune the 2.7 L V6 Eco Boost engine to do that?