Looking for the dimensions of a stock 97 z28 muffler. I currently have a mac catback but want to remove the muffler and installer the largest 3" dynomax quietflow muffler that will fit with a turn down at the end.

 

Why don't you just measure it with a tape measure? You could get rough dimensions that way.

 

Stock on a '95 Z28 is 22x11x5.5

If you get a smaller one, it'll make the car louder. I know the one Magnaflow has in their cat-back is like... 18x8x5 or something like that.