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Wish someone would make a plastic 6.1 intake. They are heavy, although I put the time in to lighten mine quite a bit. 6.4 intakes have been swapped onto 6.1's and 5.7's both. Modern Muscle even offers CNC of the TB opening.

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From what I've read on LX forums is that the Eagle 5.7 intake is essentially a plastic version of the aluminum 6.1 intake.
http://www.lxforums.com/board/showthread.php/200137-FOR-SALE-Brand-New-2010-5-7-Intake-Manifold
The TA2 Challengers also use them on their race engines