There's an old post here where I ask Oldgixxer about removing the oil cooler. I'm bothered by it but it seems to be common. A way around it and your related problem might be a custom radiator. As I recall, there's an outfit on ebay that sells K5/K6 radiators that are actually made in the US (no guarantees). They might be willing to build something at a reasonable price. The other thing that I don't understand is the IAP sensor. The OEM sensor won't measure positive pressures AFAIK and ones that bleed air are used - I think. There has to be a better way.