nrg intake manifold?

i got a nrg mc3 and i noticed it got a restricted intake manifold so i got a unrestricted 1 but to fit it will i need to jet it up and will it make that much of a difference to aceleration/topend it got standard 12mm carb with 60 main jet and leo vince tt pipe and wen i pull throtle bak it cuts out unless i do it slowly could the unrestricted manifold stop it doin this thank u 4 answering