12R exhaust// can i run an open system

03 ZX12R i want to cut off the stock system at the welds, between the manifold and the cannon( my stock system ).i would like to have an open slash cut that barely hangs out of the fairng in the back under my rear brake foot i bought my pc3, i know i need to bump up my filter and get it dynoed but will the bike run or have i just made the most expensive moped ever. i race the bike. i missed bonneville this year but im getting it ready for next year. the bike will be there and i want to run in the 200+ range. need help??? 
