i have a D15b1 with a 16 valve head, what modifications can i do to gain horsepower?

 

you dont really want to spend too much money on that motor
so go to the junkyard get the whole mpfi conversion from a si or ex
also if u find a si or ex get the camshaft out..w/ these mods u will have a peppy little motor
other than those 2 a tranny would make a diffrence take out that 4spd

i did this to b1 and it was pretty nice

 

Scrap it! lol get a d16a6 or d15b2

 

why would he scrap it for a d15b2? do what jdmpnoy89 said. if your lucky find a d16 and rebuild it or even a integra motor. but for cheap and quick hp do the mpfi swap. info is all over the internet