difference in hf and si intake manifold???
 

i am going to do an hf to si swap in my 91 hf and boost the d16 im droppin in, but i dont know if my intake from my d15 will bolt up to and work with the si motor??? Anyone here done it, or seen it done??? Please let me know cause i looked at a picture of the two and they look identical......

Re:difference in hf and si intake manifold???
 

its half the size in everyway, dont put that on a D16A6...but its possible...

Re:difference in hf and si intake manifold???
 

the HF is alot smaller, it wont flow enough, especially if you are going to boost. Try to get the stock manifold, or the D16Y8 intake manifold.