Is This Possible? Horsepower Question...

I'm driving a 90 Civic HB Si but when I got it it was supposed to be a "parts" car for my other Civic that met up with a Dodge Ram shortly thereafter.
It had in it a dying D15B2 that someone has swaped into it instead of the stock engine...I believe it was the head gasket...it was spitting oil all over the engine bay and burning it like crazy.
So I had a spare engine from my first Civic (STD) that worked great, so I threw that in there....it's a D15B1.

I've kept in the original MPFI and the 5sp tranny out of the Si and matched it up with the D15B1...but how can I squeeze more out of it? I know that the engine when it was in the STD had only about 70hp...and I imagine that has improved with the addition of the mpfi of the Si (even thought it's a little heavier car)...but how can I squeeze more out of it?

Is it possible to get 100hp out of this engine? 120...150??? If so...how can I do it? Dumb this down guys, I'm still learning, and thanks for any help.

Jason

i see no reason i trying to get power out of a d15b1....but there are a coupl things u can do:

-put a machined si head and cam on
(about $200 depending on degree of work)

-n2o is a favorite
(about $200 depending on if u can find a good deal)

-can get like mabey 10hp from cai, header, and 2-1/4 exhaust w/ a good muffler and racing cat
(anywhere from $200 to $900...all depends on how much u want to spend)

-polish ur intake
(can do it urself or pay to have it done)

-homemade turbo
(about $500 depending to the depth of what u want done and how cheap u can find parts)

that's about all i can think of

bolt ons make it fun ie int exh and the like

i see no reason i trying to get power out of a d15b1....

Because it's the only engine I have...can't afford another one right now...and want to see what I can get out of this one...I don't want 200hp or anything....just a moderate amount more.

Jason

I would just find an si head and put it on, it should give you a noticeable amount of power, cause it has a more aggresive cam. and like they said get some bolt ons like I/H/E