As Steve said, warranty is worth checking. As far as cat back and map goes, no, it shouldn't need a map if you are just changing the rear section. It may be worth checking to see if they still have the resonated section (attached to the back box), as when I changed that on the hawk for a non resonated section, it was that that made quite a difference in sound. It was only about £100 from memory. Together with a decent back box, it sounded great with no need for a map etc..
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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