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Mark,
You are over thinking this. That valve is one of a dozen useless POS piled on the CIS to help with smog control or to make the engine easier to operate sans EFI as the Carrera had.
Just unplug and cap everything then use your foot. You will enjoy the control and ease of shifting when matching revs. And yes holding the throttle does help maintain spool between gears, I do it every day and really enjoy the participation.
If you decide you don't like the foot thing then it is very easy to reverse. I'd find a good used one as there is no reason to spend a lot of money on this device.
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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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