Infernape usually (always) runs a +Spe nature to outspeed things like Salamence, Jirachi and Landorus, so no, you won't outspeed most Apes anyway. That being said I still suggest max Spe on Mence to speed tie with max Spe base 100 such as Jirachi, Mew, Celebi, Volcarona etc. After Excadrill's ban many of these Pokemon are running max Spe again like in Gen IV. With max Spe you're also guaranteed to outspeed jolly Haxorus and timid Hydreigon.