Sounds like you bought a darned good warranty(without me reading the tiny print)

Don't twist any wrenches on it and invalidate that warranty.

Take it back to installer and play dumb. Complain about the noise. If the installer blows you off, send certified letter to engine maker. That will serve as your record of complaint for later if you need it.

Be polite, but insistant. Keep your ducky's all in a row.