RE: NEED SOME ANSWERS PLZ HELP :)
1. yes
2. To put a header on a DX, you have to convert the entire exhaust to EX to pass smog inspection. Your catalytic converter is on the stock header (exhaust manifold). If you don't mind running catless you can buy just the header, and an o2 simulator for the 2nd o2 sensor. Otherwise, you need the header, EX style catalytic converter, and EX exhuast.
To answer your question, a lot of people use a DC Sports header. These are really good quality. I myself use a Megan Racing header. It is sturdy, works just as good, and only costs $150 on ebay. Only thing is, you won't pass smog inspection with it because it's not CARB certified. However, if you live in a state where they don't do smog inspection, like FL (where I live), you're fine. It's legal.
3. i think skunk2 makes one. Make sure your intake manifold is bored out to at least 70mm where the throttle body goes
4. i have no idea
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