Installed new mods - now whistling sound????

I recently got my car back from it's injector/intake/fuel pump install. The car runs like a BEAST, but it now makes a whistling/sucking sound at idle (in the engine compartment). y mechanic told me it's normal because of the intake/MAF/TB sucking more air. Is this true? Anyone else w/ this prob? Any suggestions or ideas what it could be? Help PLEASE!

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; 190 lb fp; FPR; TFS track heat Intake - 12.513 @ 112 mph (Pre-inj/fuelpump/FPR/intake)