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Check out this link though, from the looks of this, the inside of a base models muffler is almost exactly the same as a Z06's. So Im looking for some real pics to clarify.
Here's a photo of what I did (remove packing from front half and blocked off passage into back half). I think I eventually drilled additional holes in the one remaining tube (or maybe I completely removed it, can't remember): http://i1280.photobucket.com/albums/...ps5b0a7730.jpg
They literally look like the same thing.. why are the Z06 mufflers considered higher flowing? And how are they louder? I know the benefits of being lighter weight.