Don't know if this means anything, but I just bought my 04 Spec, and I had he dealer install nismo cams/header w cat/cat back exhaust/pads/springs + struts/Rear Sway Bar/Front Strut Bar/Cold Air Intake. And unless they are doing somthing special, they said that my car is still under full mfr's warranty.
Also, I know for a fact that there is a federal law that mandate's a dealer must prove that the specific mod you installed caused the defect. Otherwise they must honor the mfr's warranty. Then there is also the theroy of "mod-friendly" dealers. For example there is a honda dealer in my area that always is sponsoring tuner shows, and races, and they don't really care what you do they still cover all my friends civics. And as a side note, make friends with some of the guys at your dealer, you'd be suprised how much easier things become
