ok, guys if i install a single speed 13 tooth bell ,can i just keep the stock trans in it (tsunami) it can not switch to a 2nd gear with only the 13 tooth vented bell ,therfor it will be only a single speed? (right) and won't it save me some work and some $ if i just use my stock trans?

You can try it but i think you are better off getting the single speed tranny. If you are going to do it you might as well do it right.

ok, doe's the brake come already installed on the single speed trans?

Yes i think it does. But you can use the brakes from the 2 speed tranny. They are the same thing.

the brake assembly comes on the single speed trans and actually all the trans's.