Is the standard ECU even remapable? You would need a stand alone like Emanagement or an F-con for custom maps......Maybe...But what would i know, Im only a girl
stock ECU can be remapped as said by wasso those 3 are the only places that will do it, and it tends to get better results than people running things like greddy emange, UTEC etc.
in some cases running a standalone removes some of the cars functions like the central locking and alarm etc. uprev remap keeps the car on spec but allows a lot of play. can even ahve FI setup on the stock ECU.
I dont want to lose any gadgets, Ive had a Supra for three years and Toyota consider an ashtray light a gadget I guess standalones are okay with supporting mods but the link above (Thank you) sounds perfect and at a good price, The days of spending thousands on mods are long gone