Aftermarket Mods Voiding Factory Warranty
I may be wrong, but I don't think the mere fact of modifying the car automatically voids the warranty. I think the manufacturer has to show a connection between the modification and the reason for the warranty repair. For example, installing a Tubi exhaust would not be expected to cause the windshield wiper motor to fail. HOWEVER, given all of the information posted on this site and others relative to the dreaded software upgrades and apparent intent by the manufacturer to detune our engines, I presume an engine management upgrade would be highly suspected by the manufacturer to be responsible for any warranty repair on the drivetrain. POWERCHIP, among others, claims their upgrade is invisible. I'm not sure how to indepedently confirm that claim, but if true, seems to take care of the matter.
ALSO, manufacturers are apparently looking at websites such as ours to identify those owners who have modified their cars. A national car magazine ran an article in which owners of the Mitsubishi EVO allege that the manufacturer compares warranty claims with owners who have posted their modifications on various websites and have used that as a basis for denying the claims.
I posted in another message the liklihood that our engine is probably detuned in favor of longer-term reliability taking into consideration that it will be the engine in the next Ferrari 360 cum 430, in which it is expected to produce 500hp.
All food for thought. Good Luck!