Unless you have a nice rumble and the heat shield are being held on with regular hose clamps they're probably stock.
The stock shield straps will be solid and pressure locked to secure them. When you cut them off to change the exhaust the SOP is to use hose clamps which will be slotted and tightened with a screw.
13 Vision Tour - PCV, Top Filter, Stage 1 Pipes, TW @ +4, Metz 888s
08 Vision Street Premium - VFC, Top Filter, Stage 1 Level 2 Pipes, E4s
Past Vic - 07 KP Tour - Stage 1, S&S Intake