i'm still fairly noob about this stuff but do I still need to get a svt flex if i get the trubendz 2.5 borla SS or does it eliminate the need for a flex?
You always need the flex, SVT or not.
The basic parts go like this: Manifold/header, cat (standard or SVT), flex pipe, flex back.
Generally the flex back will have a large bolt spacing being the piping is larger. That will no align with the factory flex, not to mention the big step in piping diameter. So you should always get the matching flex pipe. This is where buying everything from one retailer helps, no guesswork.
So why don't I have to worry about the cat to flex?
Because the bolt spacing is much larger than the piping/that of the flex to flex back.
...and for right now you will need the zetec flex pipe, not the SVT.
When the time comes for needing the SVT flex it will probably be cheaper to have the zetec cut and welded to fit, exhaust shop should be able to do this.