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Depending on the kit, they will make one or both sounds. For instance the Volant which uses an enclosed box, doesn't whistle, but you do hear an increased suction sound under heavy throttle. Other kits like the K&N, AEM and others can have a whistle under light throttle, and the suction noise under heavier throttle.
BTW, the Volant does whistle if you have the Poweraid TBS, although it's not too loud with the enclosed box.
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'04 Smoke XE CC, 4X4 w/ Preferred Package. Born on 9/16/04
Performance Mods:
aFe Magnum Force Stage II Intake
Flowmaster/Borla XS American Thunder *Hybrid* Exhaust System w/ MF dual tips
Rear Cat Delete--Replaced w/ Dynomax Bullet Resos
Mobile One everywhere except tranny
Airaid TB Spacer
TB Coolant Shut-Off
Active Tuning Grounding Kit
Int/Ext Mods:
SE Pwr Mirror Upgrade
Factory Step Rails
17" OR Wheels
SE Sunvisors Upgrade
20% Window Tint
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