Flowtech Full Length Headers (Truck)

These header slid rite in and look great they increase my power and love the sound that they have added to my exhaust I've had them about three weeks now and I had snug them once after couple days of driving with them but expected that cause this be bout 8 pair of flowtech headers that we have bought for trucks we build and drive but this set headers I put on my 87 dodge has me aggravated after today first time lock my 4wd in to go cut wood and here a banging sound get truck home and look to see that the header is flexing in to my front drive shaft tearing up the bottom tube of header on passenger side my truck is stock height there plenty room for that tube be moved over to outer side header so that what I'm gonna do with lil heat but just a heads up for others and flow tech also wrong size header bolts to install them