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I Have owned both, and used both on NA KA24DE.
GT single: Fairly noticeable noise at idle, LOUD in throttle, Raspy and hangs low.
MBSE type E: Very quiet at idle, Still quite loud in throttle, No rasp and sits high enough you don't need to worry about it unless the car is sitting on its nutsack.
THIS IS ON N/A KA. The sound changes with SR/ Turbo KA obviously.
Gt single looks better and has better bumper fitment IMO.
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