Here's one
I used one from Dynamic racing products. They say it is rated for 800hp. (I think thats a little high, but that's just me). I have aproxx 425hp and it cools great. I would get one without the electric fan next time because I had problems with it. It started spinning real slow then stopped and when I took it apart, one of the solder joints had came apart. As I was messing with it two more solder joint came apart. Anyway, just my $.02. Good Luck