dyno-max mufflers good / bad?

LOOKING FOR FEED BACK ON DYNO MAX SUPER TURBO MUFFLER # 17733 WHICH HAS 2.5 INLET AND OUTLET SIZE PIPE, I HAVE JUST INSTALLED TTI HEADERS AND HAVE 318 WITH 4BARREL INTAKE MILD CAM, HAS ANY ONE USED THESES ?, DO THEY HOLD UP WELL { RUST}SINCE THEY ARE NOT STAINLESS STEEL, HOW IS THE SOUND? LOOKING FOR A QUIET EXHAUST, WAS LOOKING AT THE WALKER QUIET FLOW # 22589SS WHICH SEEMS LIKE IT IS NOT MADE ANY LONGER, ALSO LOOKED INTO WALKER SOUND FX MUFFLER NOT SURE HOW THEY COMPARE TO THE QUIET FLOW TYPE. ANY INFORMATION FLOATING AROUND OUT THERE!!!:coffee2: