I am running a d16z6 with I/H/E and hi-flow cat. I want to stay NA. What should I do next? Any responses are greatly appreciated.....THANX

 

Look into some cams and also upping the compression. I've heard good things about the skunk2 intake mani for the d-series too.

 

i would say skunk2 intake manifold, also if your header is not a bisimoto header then i would suggest you sell yours and get that one, they make almost double the power of any other sohc vtec header,def a good start for any na sohc.