i have milltek cat back non res and it revs up quicker and has made a noticeable improvement, had a power flow on my fiesta zs and lost a bit of top end and was on the ramps every month being welded back together! made the most of the lifetime warranty!
 
Humm ok may be its just me.....but it makes me think that it must have been put there for a reason when designed by Seat, does it build up any pressure in it? As when i had the original exhaust it revved up much quicker and sounded louder when reeving at lower revs? Example: When i revved to 3-4k Revs it was loud compared to now where i have to rev like 5-6k? what about the new pipe from the cat back would that make any difference as its larger pipe?
 
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Now I'm starting to wonder?

I have noticed that my acceleration has decreased as some times if i need to get away quick at the lights and i put the pedal right down nothing happens for about 2 seconds? Is this because i skipped the middle box and just went straight pipe from the CAT back???

I'm guessing that any problems as a result of fitting your exhaust would probably have come to light a lot sooner than 2 years