I remember mulling this over with an old mechanic when I had my old one. We decided it must be some sort of expansion tube although neither of us had any idea what for.
Never thought about that, seen the resonator pipes between air-filter box & turbo in large trucks, though not as a side pipe connected to the main line.
The turbo makes a nice sound in my LJ70, though i think the CT20 is up for replacement in the next year as I suspect it's sending a bit too much oil towards the engine occasionally.
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