AAV = Valve. Electrically switched valve, on or off only.
AAR = Regulator. The AAR is both electrically controlled and engine heat controlled, slowly closes as the engine warms. Attached to the intercooler and the intake manifold (bipassing the throttle).
Sounds like you are describing the AAV. Is this from a 930 or SC?
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