Is it the sticker on the air cleaner????

Technically any engine that makes more power than is needed to do basic driving on highway and city streets which ain't much. Anything over that would technically be extra, more than needed would be extra performance which would be most engines. I guess high performance would be even extra over what is generally standard performance of the time, 0-60, 1/4, 1/8 mile etc.. Obviously most don't want to drive cars that are slower than 17's now day's like they would in the past. A lot of average family cars can do muscle car times now days, they just don't have that rowdy vibe to them.