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I am trying to find out what I need to do for a header, high flow cat, and exhaust system conversion. I have a 2005 Civic LX and I want to convert to an EX setup. I was wondering what I needed to complete this. please don't tell me to use a search engine on this site. I am currently deployed to Iraq with the military and the internet is really slow, I have tryed several times. Thank you for the help.

 
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all you need is a ex header, ex cat and ex exhaust system. you will have to extend the o2 sensors though cause they are in different spots. but dont do this if you are gunna put stock parts on its not worth it. lol.

 
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i did this swap and if you plan to buy the header, cat pipe and exhuast all aftermarket(performance minded) dont waste your time or money. i did the dc ex header, random tech cat pipe and evo2 exhaust. it cost be close to $1k total and that is with me installing and extending the wires. this doesnt include the sway bar youll need form an ex as well. your best bet is to buy a type s muffler and have the piping increased from the stock manifold/cat back with 2.25" piping. this should yeind the same power and cost 1/8th of the money.

 
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^^ sounds like a good idea for what it would cost to do the swap