The supercharger sounds like normal engine drone from inside the closed car,
more like transmission drone through the firewall. Outside the car, there's
a click at 1,000 rpm when the supercharger clicks in (it disables at idle
speed), then a gear-like meshing drone as the engine is accelerated faster.
It sounds more like a rear-end differential drone rather than a piercing jet
engine whine. It's really only noticeable when parked along a concrete wall
or building, with the window down and accelerated above 1,000 rpm to click
the supercharger into action.
There is also a plastic intake piece between the front chassis metal (behind
the grille) that connects to the plastic air filter box/housing. Removing
that small piece will demonstrate the sound better; it snaps in and out
without tools. Once that piece is removed, the supercharger sound is more
apparent from inside the car, but it's still more of an engine drone as
opposed to a jet turbine whine you might be expecting to hear.
I'm not sure if they make a cold air intake for that model or not, but if they
do, try to find one. the high flow filter(k&n or somthing like it) without all
of that plastic holding back the sound is sure to give you a good blender like
sound when you juice it.
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