on my 04 accord coupe(6k miles), i changed my spring and put 18" rims. if i need to get alignment, then my warranty wouldnt cover it? just tell them car drives weird!? Or im not eligible since i have custom part?

 

No, I don't believe your warranty would cover it. Since it's an alignment I don't think the warranty covers that to begin with, regardless of modiciation. But if it is, because you changed the springs it probably won't be covered.