A seized exhaust nut almost always takes the stud with it. Warming the nut rather than the assembly, rocking instead of pulling, splitting the nut, and what to do once the stud has broken flush.
A cut is the one irreversible step in the job. Marking a square line, supporting both sides of the blade, dressing the burr, and keeping an original section intact until the system has been run.
An installation video is cut wherever nothing visible happens, which is most of the job. Corrosion, nominal-size parts on a non-nominal car, and measuring on the car rather than the bench account for the overrun.
With the car on the ground, the cold-side charge run is still reachable from above and the hot side is not. Planning the order around that, reaching blind clamps, and knowing when to stop and hire a lift.
Taking a bumper off to reach a front-mount core is mostly hidden fasteners and wiring looms, not the core itself. What sits behind the cover, what shears, and how to refit so the panel gaps stay even.
Before you buy spanners, know which tools an exhaust job actually consumes: sockets that stay square, cutting tools with their dressing tools, and support that restores the system's service position so measurements mean something.
Most intermittent weld defects are set before the arc is struck. Torch, cup, earth, filler and light decide what the puddle is able to do once the heat arrives.
A heat number is the only reliable link between a finished part and the mill certificate behind it. The chain usually breaks at the saw, and once broken it cannot be rebuilt.
