youve done it back to front m8, your car will be mapped to a car with no mods, which will give you improved performance untill you do any modding, unless you got a generic off the peg map designed for the basic mods most people get on the zeds, in which case your car will probably be running too rich as exhausts, spacer & induction, usually make cars run lean & if its mapped to your car with no mods, then when you get your zourst, etc it then will be running lean & need mapping again. so either way theres no point getting a remap first unless you dont intend to do any modding or it will just need mapping after every new mod, hence why 99.9% of people map after modding. its all about airflow & how rich/lean your fuel is running & every mod having an effect on this.