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A couple of people have done this with the standard system still in place, it will give a noticable increase in low down grunt and the tone of the system should be a little better.
Its defiantly worth doing, and once you have saved the old pennies you can always chuck the rest of the system on.
I ran a decat with standard exhaust for a while, I thought the noise was worse than standard and I also felt a gain in power when I put my standard cat back on. However, I am using the same decat with an aftermarket exhaust now and its a massive increase in power compared to standard and sounds awsome.