Hello,
I have a 2003 Mustang GT, and when I am out driving and accelerating I hear valve nose. Now I know that the passenger ride header has a habit of forming a crack over time due to the AC condition line dripping on top of the header and over time it forms a hole or a crack in the header. could this nose that I hear sometimes when I am accelerating be that or something else? it should be noted that when I put the 91 race tune on the car I can hear this nose a bit louder. is this something...

bank 2 Valve nose???