Stock cat-back????
actually... the SS and WS6 have the same mufflers... notice the same chrome tips?... and the same ex. tone?
the formulas and Z28s have the same muffler as well different tips, but same muffler and aren't as loud and throtty as the upgraded ss and ws6.
The stock muffler isn't all that restrictive, but is still a muffler. if you have an ss or ws6, i'd say don't waste your money until your car has been build up so much that now the muffler is a restriction. Not too mention the the stock chamber pipe (though never measured) looks the same as the 3inch pipe from my loud mouth.
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Most find Magnaflow acceptable noise levels. I thought it was almost stock quiet at idle and low revs when I had just a Magnaflow catback.
But anything with Headers and ORY is going to be loud! That's just the nature of the beast...





