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From what I gather is that they hold a fuel/air charge for the next stroke. This is what the advertisement said "MIP Boost Bottle Kits increase your .12 or .18 gas engine's bottom end acceleration while making the power band more constant than ever before. Boost bottle kit fits .12 O.S., CV...

The line hooks up here: The MIP boost bottle was something that was supposed to improve the performance by doing something with the vacuum pulses of the engine. I think they were more of a gimmick. I don't know much about them as they came about before the 3.3 engines.