2001 Cadillac SLS spark plugs

There are a couple cartridges, one on each bank of cylinders. The front is gray, rear is black. These are your coil assemblies. Remove them, and you will find four boots per side, those would be considered your plug wires. Remove them and you will find your plugs. Your looking at it saying, easier said than done! The front bank is the easiest coil to get out, The rear is more of a challenge due to the air injection stuff, but can be done.