No of course not. A 6700k wouldn't bottleneck two titan x's in sli nevermind 660s.
Do you suggest I OC the 660's? I'm new to the whole OCing gpus
I plan on switching to a single card in a couple more months when another paycheck comes in
Sure but your biggest issue is the fact you only have 2gb of vram, you have plenty of gpu horsepower to max out any game at 1080p with decent sli support with or without an overclock as long as that game does not use more than 2gb of vram when maxed out and a lot of new games are even at 1080p like gta v, fallout 4, bf4, witcher 3, far cry 3&4, shadow or mordor and others.