That's the first thing that came to my mind as well. Common issue. The sound should be a metalic click, and as others have said will be most pronounced during a snap throttle at low rpm.
If you wish to keep your present intercooler you can add a 965 BOV by making an adapter out of your 930 BOV. There are a few threads on that.
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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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