If I remove the resonator off would it give me more power and would make the car very loud and if i do remove it just add a straight 2.5' pipe

It will not give you more power, only give it more drone. To replace it you can use a 2. 1/2 inch pipe for one end, but the other end is 2 1/4 i believe, so you will have to reduce it

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Colton on top of this.
Yeah, the stock res is a straight through design and is not restrictive, so there is no performance to be had from removing it. Just adds more drone and a little more rasp to the exhaust note.
And your stock exhaust is 2.25" so you'd need adapters if you wanted to run 2.5" anyway.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Is the stock exhaust 2.5 before the res and 2 and 1/4 after? I wouldn't be too sure about that since i replaced it all with 3 inch pipe since my headers have a 3 inch outlet. I think thats how it is in mine, unless the NA is different of course..

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It should be 2.25" for the entire thing. DP to tailpipe.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"