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FWIW I did my exhaust system piece by piece and had a few dyno tests in between. I first added a Borla UEL header and Tsudo 2.5" HFC front pipe. On the dyno there was an estimated gain of about 10 whp (compared to other stock baselines). Next I added a Ecutek tune which added another 17 whp. Then I added a Perrin 2.5" over-pipe, custom 2.5" Magnaflow axle-back and gained another 6 whp. My last exhaust mod was a custom 2.5" mid-pipe with a Magnaflow resonator for a loss of 2 whp. All dyno tests were done at the same shop, same dyno but the ambient air temp was much hotter for the last test which likely explains the loss of 2 whp. So not much to be gained from a larger mid-pipe.
Your proposed system would feature a 2.5" header collector dumping into a 2.125" over-pipe/front pipe and then a 3" cat-back. This is hardly ideal, not to mention the very restrictive cat in the front pipe. I suggest that you start with the header and move your way back from there. The stock cat-back is not very restrictive although not the best sounding.
Also, a 3" cat-back is larger than necessary and will be unnecessarily loud.
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