There are six clips that hold each kidney grill on, 2 on the top, 2 on the bottom, 1 on each side. You have to slip your fingers in between the slats to access the clips. Press down on a clip to release it and then gently pull the grill out. You might have to get a screw driver to hold the grill in position as you work your way around to each clip, otherwise the clip might slip back into the locked position. Once you get one grill out, it's easy to see where the clips are located, which will make it easier to get the 2nd grill out. Be patient, don't force the grill. Once the clips are cleared, the grill should come out easily. I just replaced the chrome grills on my SG 330i with carbon fiber grills, and it looks awesome. It took me about 10 minutes to get both grills out. Good luck!