Ok so I've had my exhaust welded at the header collector few times. Dad tack welded it on. That didn't work out so well. Had it welded by a local performance shop. That guy missed the seam & the top of the collector completely. Had it welded by a professional welder. He welded the seams all the way around & it held up for several days. Now the light is on again & the car is running slow & I can hear the leak. Question is should I ask the welder to go over it again since he said he would if I had problems or should I maybe go back top stock exhaust/ headers? I have PaceSetters all the way back.