You could also spray some starter fluid in the suspect area on the intake side. If you are getting pirated air in the intake you'll hear the engine rev up as the starter fluid spray will burn with the air and fuel.
Use it sparingly though as it combustible.
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3
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