I'm gonna get some cheap aftermarket headlight bulbs for my mustang. I beleive the stock bulbs are 55/65 watts, will I do any harm if I get 100/80 watt bulbs? or 90/100 watts?
Other than blinding other drivers, overloading the OEM wiring and connectors (our headlight switch connectors melt as it is) and possibly melting a plastic headlight housing, you should be ok.