I just replaced mine last week. I installed CF ones on my Titanium Beast and they look hot! I'm also adding the CF side vents as well
It took me a while to figure it out but finally was able to do it
First, You need to open you hood. You'll find a black rubber round rubber that's on the edge of the front of the hood. If you wiggle it a little, you'll be able to take it completely off. It's attached by a few clips that are easy to remove. Just be patient. Once that long piece come off, It's about 30"-35" long, you'll be able to see three clips on each kidney. Push them down and out. This will release the entire top portion. Try not to let them clip back on.
Then, insert you entire hand side ways from the second opening on the inner side and try feeling the clip. Once you have a good feel of it, push it in while you pull the grill out. That's all you need to do. A little bit of patience, wiggling and you're done. Note, do not install one grill without removing the other one out! It's a snap to remove the second kidney once the first one is removed. Make sure you put back that long rubbery piece back.
Your done!
At this point, I wish I have taken pic's.
Good luck, and hope this helps.