Yes, the SVT has a tuned exhaust from the factory, aftermarket exhaust for it will net you better sound but very little gain in HP. The exhaust on the ZX3 has smaller diamater piping and benefits greatly from an aftermarket exhaust system.
The answer is yes. The SVT has a different header, flex pipe and cat so the fitment is different. ZX3 will not work with SVT. And to add to what Pat247 said. The SVT exhaust is actually larger slightly than most aftermarket exhaust. Although aftermarket will not lose anything and will gain a much better sound.