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A single 3" is plenty of flow for a 3.7 liter motor and likely easier to find room for along the tunnel than dual 2.25/2.5 pipes. I'd join the two 2.5" pipes after the collectors, run 3" back to the stock muffler position and use either a transverse 3" in/out for a single tip exit, or a 3" in/dual 2.5 out for twin tips.
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"To know a thing well, know it's limits. Only when pushed beyond its tolerances will true nature be seen." Amtal Rule
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