Coolers for the C5...a couple of ways you can go. If you are going to run the ORR's or any other track events that will allow you to be at speed for continious laps, you will need an engine oil cooler, and one each for the diff and the trans. Space is at a premium. Being that your Mallett 435 has a big aftermarket cooler they had designed for them, you probably won't want to replace it with the big rad that Rippie has that incorporates an effective EOC. Second approach is to install an Aeroquip water to oil heat exchanger (cooler) in line on your upper rad hose. Ther is a minor modification that must be done to prevent the oil bypass to function. This will insure that it always is circulating through the EOC. I only know it exists, I don't know exactly what it is. Peter at Rippie told me about it, I'm sure Chuck can tell you what needs to be done. (He uses this method) This is not a problem with the water to oil unit because the oil temp will be stabilized sooner in cooler weather by the water in the rad. As far as the other two, you will need TWO more. GM originally recommended only one. Their logic was that being that they were connected together, that one cooler would "wick" away heat from both. (they must have thought by osmosis ) They have since changed their "theory", based on real world experience. I think there is room up front for both. GMPP is supposed to have a new kit out for them. Depending on the mufflers on your C5, some of the tuners are laying the small coolers on their side (flat) where the mufflers used to go. This presumes a SuperTrapp type setup. The other way now is to plant them on the "front" of the rear wheel wells. I think that there are some Z06 rear brake air ducts that are now being used. There's some food for thought. At least it's a point of departure for you. I wish I had more specifics for you.