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I just got a 00 Civic Si. All it has is a short shifter, cone filter (from local auto parts store) and a exhaust muffler w/tip. So I'm trying to get some help on what I should do first. I"m not going to go crazy I want to keep it tasteful. First I know I'm putting on a full CAI, then should I do coilovers or header? Need some help and advise. Thanks

 
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That's just personal preference.

 
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I know, I was just wanting to hear from some people who have gone through this process and to give me some advice. Thanks

 
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What are your ultimate goals for the car?

 
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Welcome, and congrats on the Si! Nice cars!
I'd say go for coilovers first. Get the expensive portion out of the way quickly. While you're at it, wheels and tires would be a good consideration. Maybe later do a full catback exhaust and better intake (at least get a better filter that fits for the current one, not a cheap auto parts store kind)

 
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This is some what going to be a DD, so I want some quick upgrades that will make me love more until I have the money to bigger mods. Thanks

 
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Coilovers

 
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What brand and where should I buy a header?

 
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Headers on B series engines are never a bad thing. Just don't go cheap ebay.

Anything Tein is good as far as coilovers are concerned, I'm not sure if Progress makes coilovers for 6th gen.

 
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Which would be a good cat-back? HKS, Greddy, Skunk2, DC, Invidia, etc......