just seen your model number in the side tab: if its a 1999 car you got four options:
1. ECUTEK, about £550
2. Apexi about £350 for the unit then map / set up is another couple hundred quid but more people can do apexi or you can buy the cable to do it yourself
3. alkatek - can run maffless etc have launch control, dual maps, loads of toys but expect to pay out about £1k inc mapping
4. Open Source i.e. Eculabs remap basic is about £450