if the carbonfiber hood you get only shaves off 8 lbs, thats a complete waste of money and one heavy ass cf hood. stock integra hood weighs somewhere around 40 lbs. my cf hood practically weighs 10 lbs.
fiberglass front end is a shattering accident waiting to happen. just stick with a stock bumper.
yes you can remove all carpeting, sound deadening, panels, spare tire, and seats. car will be noisy as heck though.
removing the A/C and PS will help some too as well.
you can also remove the lower intake resonator box.
get a set of light weight wheels like 10-12 lbs.
get a lighter exhaust system and muffler.
however, in my opinion doing all this in bone stock integra is pretty lame. i can understand on track days, but to just drive around gutted in an otherwise factory stock car on the streets is useless.