IR EFI is Independent Runner, which means that it looks like Webers since each cylinder has its own plenum, as opposed to a single- or dual-plane manifold, where all cylinders share a common plenum or two.
Supposedly IR gives a little more responsiveness than a common plenum. Looks cool too, but those looks have a price. Probably the best known off-the-shelf IR system is Dennis Quellas, which will set you back some $4500-$5000.
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Charlie McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness across Europe"
http://briefcase.yahoo.com/gt5s_1985
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