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To answer your question, yes it would fit, notice how option #1 lets you add a downpipe.
The exhaust itself isn't restrictive past the the ubend area but your eliminating that w/ the downpipe. The rest flows just fine till about 300-350hp then that's when it debatable that it becomes restrictive. Most will never reach that point.
Most would just do headers and leave the rest of the exhaust alone unless they're going for a different tone
What I would do is leave the stock exhaust if your wanting a better tone just cut off the stock mufflers and replace w/ (insert brand of your choice) and have them welded on. Saves you a bunch of money and the ZZP exhaust is excessive loud... I wouldn't go that route you'll need up hating it quickly