hi i have a mk3 gofl 1.4 1993 model

i wanted it to be a bit quicker than what it was so i done a few easy bits like exhaust system and induction kit

i know my car is single point injection and i just wondered if i could buy maybe a bigger injector or maybe do something to give it more fuel to work better with the induction kit or something?

am i able to buy a carb inlet manifold for it and put twin 40's on or something i dont know?

please post me your ideas and tips please =)