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The Stock air box is designed to quick down the intake noise for a comfortable quiet ride.
The air whistling you hear is simply the motor breathing, the throttle body never closed 100% so some air always slips through on decel.
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2007 Toyota Tundra 5.7 Slate, Double Cab
1990 Nissan 240sx - Daily Driver
1989 Nissan 240sx Pro Drift Spec (the HATCH) - FOR SALE -
1991 Nissan 240sx Pro Drift Spec (the COUPE)
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Performance Parts - Technical Consulting/Support - Track Proven
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