HI CHRIS, THE NOISE IS PROBABLY NORMAL UNLESS YOU CAN HEAR IT VERY DISTINCTLY, STANDING ABOUT A FT FROM THE CAR, OTHER THAN THAT IT WONT HURT ANYTHING, ONE THING THAT MAKES THEM SOUND NOISER THATN MOST THE VLV CVRS ON THE 98 AND LATER ENGS ARE PLASTIC, EVEN THOUGH THEY LOOK LIKE ALUMINUM. JERRY