weight reduction isn't going to make your civic ANY faster..
100lbs roughly equals .1 secs in the 1/4 mile.
There isn't more than 500lbs of extra weight in a civic... I'd be suprised if it was even near that... that's a whole .5 secs in the 1/4... SWEET. now it's a 16 flat 1/4mi. ripper.
And to the poster...
You can port your head till there's nothing left to it... it's not going to make the car significantly faster... same goes for reducing the weight of the flywheel... it will help and it will get quicker...
But that and a 50shot should net you about 52 more hp.
If you really want to drag your civic then I'd expect to spend lots and end up with not that much.
Your best bet for cheap LARGE increases is a turbo...
check this site out...
http://homemadeturbo.com/
and here's a link to a guy on H-T who sells piston/rod combos that with NO other internal mods allow you to run in the neiborhood of 16-18psi... 20+ if you put on a thicker headgasket.
http://www.honda-tech.com/zerothread?id=267641