Les, I would think that the reason twin plugging a 930 isn't all the rage is due to a very low return on the dollar. It's not a cheap undertaking and 30HP is nothing on a turbo motor.
Personally I would not use the advantages of twin plugs to bump the boost but rather as a safety margin for hot temps, hill climbs, and bad gas.
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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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