Adding a granny gear?
 

I have an '04 P.2 and I want to add a granny gear and a bashguard. Can I just buy the gear and bashguard, or will I have to buy the whole thing (http://pic10.picturetrail.com/VOL326...6/66023746.jpg)? The P.2 comes with the Truvativ Hussefelt crankset, but with just 1 38t chainring. Thanks.

Depends on the crankset. If the ring is bolted not rivited to the crank arm you should just be able to undo the bolts and fit a bash guard. As it currently has only one ring the bolts might not be long enough so you may need a longer set.
You will be able to fit a granny if the crankset has the threaded holes for the bolts.
Your current chain guide will no doubt not work with two rings so if you need a guide be prepared to replace it with a duel ring version eg e.thirteen drs

along with your allen key (hex key) you'll also need the chainring bolt tool. It's itty bitty and cheap, but necessary for installing that bash guard. For a granny you don't need it though.

Thanks for the help. My crankset doesn't have holes for a granny, so I had to get a new one, along with an e.13 DRS.