I had the Borlas Stingers on 2 different C5's, on the automatic car, they had a bad drone at cruising speeds, on the Z06 with a 6 speed you didn't notice it anywhere near as bad, I put the titanium Z06 factory exhaust on my exes 02 C5 automatic and it had a little tone but it picked up a really cool shreik about 3 grand when you were into the throttle hard.