Idler arm gouging headpipes

Beautiful headers those are. I had the same problem and didn't want to do any cutting. I put a cable around the header tube that was rubbing on my idler arm, then connected the cable to a strong spring tied to the frame. The heat of the tube upon running would allow the tube to weaken just enough to warp the tube in the direction of my spring. That gave it clearance to clear the idler arm.