Engine & Internal - d15a6?

I need to know as much as possible about this engine, mainly the intake maifold. Will the intake manifold off this engine be better than my d16y7 intake manifold? And is their a vtec and non-vtec of this motor? Also, is the throttle body off the d15a6 better than my d16y7 throttle body?

all D series throttle bodies are the same size so going from one to another will not help. Are you sure your not talking about a D16A6 and not a D15A6.