Im looking to upgrade my back box to something with a bit more bite and a deeper note, found the two below and was wondering if anyone had any experience of them and what they are like to fit.

many thanks

http://new.ulter.com.pl/en/offer/dedicated/78/fiat_grande-punto/108#435

http://www.sportex-exhausts.com/Performance-Back-Box-Exhaust-BF7/cat/3/sub/0/subsub/0/product/44

cybrand/cybox do a stainless version for 120 worth a punt