Gm Dual Pass Endplate

I want to order and install a gm dual pass endplate on a 2006 Chevrolet Cobalt SS Supercharged 2.0L ecotec, but am wondering if it is really worth it? Has anyone here installed one yet? If you could include pictures that would be appriciated.

here is a right up on in the cobalt form http://www.cobaltss.net/forums/showthread.php?t=60809