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Final note:
Because I'm not unappreciative of the inputs of others, I changed the plugs back to stock NGK SILZKR8E8G plugs. With the MSD coils, TDI turbo tuner and Gumout, the car still performs as I had originally hoped, though perhaps not quite as spirited as with the Bosch plugs -- by a mere touch -- gauged by the seat of my pants only.

Happy motoring!

-zed
 
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