Im doing a custom plenum ,And im just wondering is there a difference between the size of d16z6 runner's and d15z1?Im going to put the d16 head on,I hate vtec-e ,And ive heard this will drop my comp down a bit .but i havent got the funds at the moment :_( .Does the d16 have a egr valve? ill post pics of my intake manafold tomoro if no body no's.

 

 

god, that manifold looks lamo-o kinda like the D15 on the HF manifold, yes the D16 ports are alot larger than that. The z6 uses no EGR valve either. I would swap heads and intake manifolds if possible.

Jeff

 

I thought so,also is the d16 throttle body bigger than this one ??d15 is a 40mm .Cause im putting twin throttles on the new plenum.Its a 38mm primary and a 52mm secondary,i thought this would be a good idea cause the small primary will let it idle like a stock t/b but then when u push it over half throttle income's 52mm more space for air to get in.