Well this is all over the internet with videos on youtube but it's not fully explained well so i made my own and it turned out great so i will be doing this for this lovely forum so people would do it to their xbox without voiding warranty and it will work very good as i can feel the air going out from the back really cooler
1st lets start with what u will need
1) Two 12V PC colling fans
2) 12V AC DC Adapter
3) A PC power connectivity plug
4) Electric Tape
5) Card Board
6) Wire Cutting tool
Now let's move to the work
1) Cut off the connectivity are at the end of the Adapter wire
2) Rip off the plastic cover and get good length of the wire shown
3) Connect the Fans together as shown
4) connect the PC power plug to the fans as shown
5) Here is the tricky part: the PC power plug got two wires Yellow and Black so black is Negative( - ) and Yellow is Positive(+), while the Adapter got two black wires but one of them is striped with white color The Black is Positive(+ ) and the Striped is Negative( - )
Connect the Negative to Negative and Positive to Positive
Now electric tape the firmly and make sure they are firmly sealed
6) Now let's test if it's running well
7) Place the fans on the Cardboard shown and Electric tape around to keep them intact with the edge of the cardboard and
Here is how it's supposed to look like
8) Final project done and air coming from behind really cooler
Notes:
You can similarly add two extra fans at the back but u will have to connect the AC DC adapter oppositely because at the back they r meant to suck air out so u will be connecting + to - and - to + this way the fan will rotate to the counter direction of its normal direction.
Hope u like this guys and Start cooling Down
