I'm no expert but maybe I can bump your question so you get a better answer.
Seems to me that those stock speakers are probably not the quality you are wanting. I would probably leave them as original and install a 3.1 wireless system with new small speakers mounted over the seats. Don't you have a cabinet there to run power wires?
Can't begin to answer the audio lag question. Is this a big problem with surround systems in a small space?
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