I had that happen when I had a shop fit the xpipe on mine. I put in the headers and cat back then sent it to them to fit the xpipe. Told them what I wanted and they kinda did it, after the second trip and complaints. The guy forgot to mount a hanger to keep the weight off my headers after I cut the one off my old xpipe and rigged it to wok with the new one. At least when I came back to complain they took it right in and did a no cost to me fix, and a one year warranty against defects and loose hardware 
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98 4.6 SOHC GT
MSD coil packs, Headman street headers, BBK X-pipe w/cats, Cherry Bomb vortex cat back, ZOOM clutch, Auto Meter 3 pillar w/oil press, water temp, and volt gauges, Alpine head unit. work still in progress.
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