So they take off a load of stuff then charge more for it - you can tell Porsche is part of the VW Group! The interesting bits are the LSD and 'motorsport' engine mountings. Engine is standard. Would like the roll cage, tried to get one for my car when I bought it but only custom build available in 2009.
Nice pdf of engine parts there also with part no's
http://www.seat-sport.com/en/ibiza-sc-trophy/SparePartsCatalogueIbizaSCTrophy2012.pdf
In action
http://www.youtube.com/watch?v=JI4Qc5Uw_J8&feature=related