One bottle probably won't do alot for you - but adding a "bunch" of alchohol will reduce your total HC count. Your car will try to richen up some due to the higher O2 content of alchohol, but a big chunk of your combustion will be from the OH so your HC's will still come down. Your car may run like poopoo like that, but your HC's should be way down anyway. Also, isopropyl is kinder to the rubber lines and seals than methyl.
Anyway, the resonator will have no effect so don't sweat it.
