Have a spot weld put on every connection. It will never rattle, and the pipes will stay whereyou want them. I did this on an exhaust system I installed 16 years age and it still doesn't rattle.
89 LX Notch: Floo-Tek 5.0X heads, GT-40 intake, B-303 cam, Dynamic 3800 converter, 4.10:1 gears & lots of suspension work. 12.50 @ 106.42 MPH.