how much of a horsepower increase would you expect to see from a stage 2 cam swap on a d16z6 with only I/H/E????

 

Hard to guess anything like this without knowing which cam your going with. If it is the crower which I assume it is then I'd say with tuning around 130 to 140whp with around 110wtq. So around stock B16 power

 

Depends on which one and if you tune for it or not. Just throwing it in will probably make the car feel really sluggish down low and may and or may not break up on the high end.

Oh, and your idle may be all screwy.