Do I need an intake fan?

[Ozzy24]

Hey guys, so I've got an i7 2600k running off a gigabyte z68 mobo along with 2 4gig DDR3 RAM and a GTX 550 TI that has twin fans. Currently my exhaust fan was making a huge buzzing sound on startup that would eventually taper off so when I had a look yesterday, I saw that I have the faulty exhaust fan mounted on the grate at the back of the case (only held in by 2 screws I might add), a normal CPU fan with heat sink, a PSU fan (the PSU is located at the upper end of the case so not sure if its blowing air downwards into the mobo or upwards into the PSU?) and the twin fans that cool my GPU. Now I need to replace the faulty exhaust fan but the thing is connected via a 4 pin molex and it looks kinda complicated to change out, does anyone know if this mobo has a custom plug in for the case fan? Also there doesn't seem to be an intake fan at the front of the case and no mounting for it, do I need an intake fan?

 

[Cons29]

better cooling will of course help