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Today on our 2012 Infinity G37, we'll be test fitting the Thule Sonic Large Rooftop
Cargo Box, measuring 13 cubic feet, in glossy black, part number TH634B. With the Thule
Rapid Traverse Roof Rack System on our vehicle, we'll begin our test fit by placing the
Thule Sonic directly onto our load bars. With the feet hanging out of the bottom of the
box, we can adjust them as necessary to fit around each bar. We'll move the key to
the unlock position and push up on the lid of the box to open it. We'll find two
hand knobs on this side, which will tighten to tighten our feet around our bars. One of
the great features of the Thule Sonic, is its ability to let you know when each foot
is secured around the bar. While tightening, you'll hear a clicking noise when the
clamp
is tight enough.