This pair of mufflers are the NPP style which have
the vacuum operated butterfly valves to allow exhaust flow to bypass the
muffler baffling for increased flow and sound. These have been cut off where the exhaust
pipes enter them. I bought a pair of Z06 mufflers in the same condition to
provide quieter operation and welded my exhaust pipes to them. The NPPs were a
little too loud for me when the bypass valves opened behind an LS 454.
Mufflers for Sale
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