The front lip extension is also referred to as the "Mustache Bar". It is an aero piece that goes over the opening in the fascia, just above the fangs.
The Chin Spoiler is lower add-on piece that attaches to the lower part of the facia. This is what people commonly purchase.
The Front Lip extension is less commonly purchased. The S-Tune 370Z looks better without it in my opinion.
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