Ok, I HAVE A 97 ls with dc header, high flow cat, and apexi ws2, and after it warms up, i get a hummmmMMmm noise every like 1000 rpms after 2200 for a few seconds.......what the hell is it and how can i get rid of it!!!!!

 

bump

 

i get the asme humming sound on my ws2. I know many people who have this problem and i think it is a factory defect. YOu can try to call apexi and see if they will take it back and send you a new axleback or something.

 

i have one..and my set up is like urs..and i dont have a problem

 

same here