Yes it can be mapped to be made better however result from even the best Renault mapper s in the country are by there own admision small. Some are now even advising a stand alone/ piggyback ecu . I'd fit a filter and leave it unless you have bigger plans ie : bigger power gains , de cat etc etc
i think with a decent cat back exhaust and keep the cat i think it can be mapped out, but if you go decat then it can be made better but still very noticeable, then your talking standalone ecu`s etc, like kevo did. but youre talkig money for that.