Edited: 6/12/2006 9:34:23 PM by Mires
G1Teg.org. Whole website on 1st gen Integra. Im guessing the motor was swapped in cause the 1st generation Integra didn't have a b16. If it is infact a b16 there are a few nice headers. Toda is by far probably the best bolt-on header. SMSP and Hytech are both probably the best headers period but are custom made headers which would require a new cat and possibly new exhaust and are very pricey. If you just want some decent gains DC Sports makes a good one for a pretty good price. The gains will be ok but by far not the best.
Here is a test that was done a while back. While it was done on a Type R all these companies make B16 headers and you will see similar gains. They may even be the same but Im not really sure so dont quote me on that. These are by far the best. There are dyno plots to show the improvement.
http://bob123e.tripod.com/thegreatheadertest/