Rattle Rattle Rattle... OEM Style Exhaust...

Hi all,
So my OEM style exhaust (previous owner had replaced it) rattles like crazy, at first I thought, ok its just a heat shield hanging down. I put it up on the lift and found no interference between the exhaust and any point on the car. As my friend and me hit the pipe it rattled, wth? We unbolted the post CAT pipe and sure enough there was a inner pipe just floating in there. We tried to pull it out but it wouldn’t budge so we tack welded it, but after three days the weld broke and started to rattle again... I'm just floored that a company or factory would waste the materials and time to put a second pipe in there, it just doesn’t make sense to me. Anyway, has anyone else had this issue?
Thanks,
Chambers
So my OEM style exhaust (previous owner had replaced it) rattles like crazy, at first I thought, ok its just a heat shield hanging down. I put it up on the lift and found no interference between the exhaust and any point on the car. As my friend and me hit the pipe it rattled, wth? We unbolted the post CAT pipe and sure enough there was a inner pipe just floating in there. We tried to pull it out but it wouldn’t budge so we tack welded it, but after three days the weld broke and started to rattle again... I'm just floored that a company or factory would waste the materials and time to put a second pipe in there, it just doesn’t make sense to me. Anyway, has anyone else had this issue?
Thanks,
Chambers