just an induction kit will give 1 or 2 bhp increase. stick a cat back exhaust on aswell and your looking at about 5 bhp increase in total. then bluefin it or similar an you should hopefully get an extra 10 from that makin bout 15 bhp more than standard.
these are only rough estimates.
oh an dont get one of these shit resistor mods off ebay that say an extra 20bhp cos they are crap an fuck up your engine!