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They are not air tight. Different engine type numbers use different AAR's, some of them have bleed holes as part of idle control. Typically when the AAR starts getting sticky it will either not shut all the way (high idle) or stick closed (low cold idle) or stick open (really high idle) depending on what caused the failure.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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