How many headers do you need? For a D16 I suggest JDM 4-8 headers... they ensure that the VTEC fluid can run freely, allowing a smoother VTEC engagement than stock, restrictive headers. They split off right after the block into two seperate pipes, so the VTEC fluid can easily run out of the motor, then be cycled around back in. I think I have an extra set of them laying around from my D16 build I did.... Also, if you want a really quick and easy power boost, check out some rotary pistons. They're made by mazda, but will work on your honda...