I have flowmaster 40s that exit in front of my right rear tire, great sounding but when I get on it at around 4grand there is a whine similiar to that of an SC or Turbo. I had cracked headers when I noticed this whine and had them replaced with Edlebrocks, sounded healthy without the whine now it is back. I checked for leaks but I cant tell, all the welds are shitty and rusted any ideas? or is this nothing to worry? I do like it though because I get the second look as if it has an SC or Turbo. POSER!