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I want to make my 2005 Civic EX better, I don't know much about putting performance parts in cars. I have worked on cars before, but not much more than standard work. I was wondering what are some changes you can instruct me on for between 100-400 bucks (per part), I already looked and a cold air intake, but what else? I realize that I will spend a decent amount. any ideas? thanks!

 
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Lets see along with cold air you can do a lot of things. Like header, high flow exaust. That will incress horse power, and lets not forget a new fuel rail and injectors. A new computer would be great as well. Then there are the things that would cost a bit more like a supercharger for an automatic or a turbocharger for a standard. But you will be spending a lot of money if you want high horsepower. the best way to go would be a new computer(ECU) or a chip for your current ECU. Like most people you would probably be surprised at the amount of power that simple upgrade will get you.

 
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Do you know of any good ecu chips? I was told about unichip, but it is very expensive. also, should a chip only be installed after all the other parts are put on? or does order not matter? and are super chargers street legal?