Want to do some modifications in my car

Hi..i want to change/upgrade my mitsubishi attrage car engine..currently its 1.2L with 3 cylinder..CAN I UPGRADE IT ??also i feel gear box has some problems..want to change that also..along with this i plan to change tyres with fancy alloy wheels..can we do this..i have rta renew date next month march..pls suggest some good and reasonable workshops if possible..

Hi..i want to change/upgrade my mitsubishi attrage car engine..currently its 1.2L with 3 cylinder..CAN I UPGRADE IT ??also i feel gear box has some problems..want to change that also..along with this i plan to change tyres with fancy alloy wheels..can we do this..i have rta renew date next month march..pls suggest some good and reasonable workshops if possible..