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will an 99si header fit a 99gsr motor?

i have an 00 civic with a 99 gsr full swap and im installing an auto meter air/fuel gauge. i need to know what pin on my ecu is the o2 censor wire, if that is the correct place to attach it. thanks

I have a 99 JDM B18c1 in a 00 civic ex. swap has been in for about 10 months with no problems. but mights headlights dim to about 50% when i get on the gas. is this my alternator or something else? thanks guys