After a bit of research, we have made a change to the user profiles.
This change means you no longer need to keep the specs to your PC in your signiture! You can use your signiture for other things now!
So here's how you do it...If you go to your UserCP:
Then go to the 'Edit CarPC Specs' link:
Once here, you'll be able to enter in your specs:
A tip. If you want your specs to show up under your user name as a drop down menu, you will need to enter your motherboard.