kinda hesitant about the flex a lites.. I have heard nothing but bad from them. Personally id go with the ls1 fans. Ive had mine for 2 yrs and no probs yet!
Derek

 

I installed th dual LS1, ran a nelson harness and loving it. The longest part about the install was the brackets I made for the top, which only took 1/2 hour, due to paint drying. It is really quiet too. I hear some say it is really loud, but I cannot hear mine at all.