Mountain Biking - need new BB?

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Finally convinced my parents to let me get a few things for my bike.
Im gonna get the TruVativ Stylo Team Crankset. It says ISIS Drive interface only.
And i dont know jack bout BBs and stuff. So can you guys tell me if i need a new one?
I have a completely stock, '03 Giant Iguana Disc.
Do you know what crank is on it now?
They are the ones that came stock with the bike
They are the ones that came stock with the bike
No BB listed on the giant website.
The cranks are Giant, I dont know them but probably square taper
Whats wrong with your current BB/Crankset?
I havent really had many problems with the stock cranks, I just friggin hate them, they are heavy and so god damn ugly.
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