My brother is a engineer for Northern and so I know more than I ever wanted to about alum rads. I will spare you all the details but just buy the Northern and be done with it. Even though they are a lot less money that the Griffin or Fluidyne they will cool better and are better made. It all has to do with how they are put together, The Northern uses a newer more modern method of construction that is completely welded and has no dead spots, They are American made and will fit like the factory ones and with a good fan, will cool up to 400 cu.in. Just remember that it is all about air flow, the fan is the key. My car actually has a prototype in it.