Part of it was making sure the airbox in front of the radiator was completely sealed so nothing could go around/under/over the radiator. There were a few gaps here and there. Then, venting the hood. The hole I cut in it at Zcon helped but it wasn't until I added louvers that it really cooled it down. Probably becaues that hole I cut was too big and I think it was actually scooping air in at the back edge, the louvers solved that. I'm guessing that the scooping affect may have added pressure to the engine bay which could have reduced the airflow through the radiator and oil cooler. How's your car coming? Any new mods since Zcon?