hey im thinking of getting ec 90 sl carbon bar for my bike. for $50 is it worth it?

What bike you riding? If it's an entry-level bike, I wouldn't bother slapping carbon bars on it. Upgrade some of the vital components first.

im riding the ranier in my profile

Ah yeah, that's right. Not too bad of a component list eh? Sounds like that bar/stem set would be a good deal. Just make sure it fits first. Some prefer a flat bar, some prefer a riser, some prefer low stem angles... the list goes on. It's best to try the sizes out before you're stuck with a set that's uncomfortable for you.