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I just purchased the Kamikaze header for my 01 civic lx, and from what ive been browing on the forum, I've heard that I need to get 02 sensor in order to get rid of the cat. Do you guys by any chance know which one and where can i get it online?

 
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i wouldnt try to get it online your local pep-boys or auto-zone should got the same headers on my 01 ex

 
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You need an O2 simulator... not an O2 sensor. You already have 2 sensors, one before the cat and the other one after.

By removing the OEM header you remove the cat at the same time... this will give you a Check Engine Light (CEL) because the 2nd 02 sensor will detect a problem with the cat (duh!)... The O2 simulator will allow the sensor to think there is still a cat there...

Check this web site: http://www.o2simulator.com/, but you can find cheaper elsewhere also...

Good luck!