For those of you that might be interested...I chose to "stick" with the stick packs (too many packs invested) and wanted to do the "BK fan MOD". I mounted up two 25mm fans. I am running 16T pinion with a 60T V2 center diff. Pretty tall gearing, but after a ten minute Main my ESC/MOTOR temps were 135/165 with an ambient temp of 95 degrees out. So I am pretty happy with the fans. I had to chop off the rear Exotek chassis piece, Mod the rear bottom chassis piece, Mod the rear top chassis piece, and Mod the RX box to allow the fans sufficient space behind them. Here are some pics: