The bar is a roll bar, have seen many differnt types of these... alot of them are just for show, and will not actually support the car in a rollover, but they add to the cars looks. the price is gonna be up to what you want looks or functionality...
As for the 5.0 the sky is the limit on what you can do. I would stay away from the mod chip there are better ways of making power.
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Cold air intake, UnderDrive pullies, and Gears will really wake the car up.
Then if you still want more power swap out the heads, cam and intake and get some serius power.
