if u swapped from the original intake mani that has the butterfly flaps u will have to tune it, would not run right, you will gain power just by swapping it and not tuning it, but it will hurt your engine because your computer still thinking it has those flap gonna throw a code and won’t reach its full peotential I’m currently running a 96 b18C1 GSr vtec with a skunk 2 intake mani I had the butterfly flap intake manifold on mine, got a hold of a P28 OBD1 chipped it with a GSr basemap but little to the aggressive aide vtec kicks in now 4800-8200, pula good and I’m pushing around 200 by the feels of it but can be little under that mainly all stock but ARP and headstuds coppersprayed cometic headgasket and miner head work done, expesially if you in a place that needs an E-test I just plug the Orignal ecu in, and fix all lights before going if any for the one that don’t need plug it and of sniff or aslong as there is no lights

you can make decent amount by changing your vtec kick in around by getting a p28 chipped with basemap and the skunk2 intake because of u don’t you actually loose power because with the butterfly flap intake mani, vtec fully opens at 6500, if you want to make the intake manifold more benifit to you, u tune vtec half throttle kicks in 5500, ends 8200, full throttle kicks in 4800-8200, you will notice a big difference make sure it’s a OBD1 p28 and get a jumper harness if needed or what ever u need for an ecu if in original integra body mine is done in a 2000 civic coupe with a 99/00 SIR engine harness