I have the BBK TB on my ride. Unless you plan on adding forced induction, save your $$$ and mod elsewhere - the stock TB will flow just fine.
Having said that, I like mine. After installing it, I had the dreaded 'BBK whistle' (sounded like a s/c, heheheh). That got old fast so I polished out all the sharper edges of the internal duscts with a dremel - walla! No More whistle. Also, the BBK throttle spring is quite stiff - some folks don't like it.
But it does look really nice...
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2001 SS: #2853, Screaming Blue Metallic, 6M, All GM Options, SLP SS Grill, SLP ZR1 Chrome Wheels, SLP Floor Mats & Custom Deck Mat