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hi i have a 2003 honda civic sedan with stock everything i want to take it to the next level

im planing to get K&N air intake or AEM, Magnaflow Exhaust and megan headers or dc sports.

so what i need is from you guys is to tell me whats is best for my car

all options are acceptable please let me know that you think thank you

 
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dont get the intake or the headers, get a turbo with kpro and then sink your money into quality suspension setup.

 
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if for what's best you mean noise, they will be perfect, they will not change much in terms of power but noise will go high.
agree suspension