I'm doing research on my next mod I'll be doing in the next few weeks. I'm going to upgrade the stock 2010 heat exchanger, install the Roush intercooler tank and replace the pump (might as well while I have the bumper cover off). I was set on either the C & R exchanger or the Shelby one (both C & R from what I've read). Question is, are the HE fans really necessary on these cars? I had the twin 11" Spal fan upgrade on my 2.9 Whipple 2012 GT. Seemed to work ok, until I experimented one day. I installed a switch inside for the fans to control them. One day in the spring (75* ambient) I decided to turn them off to see the difference in IAT2's. Really only saw them rise about 5* with the fans off. Didn't see any difference while cruising. With the fans on or off at a stop, the IAT2's would go up dramatically until the throttle body opened when I accelerated (which is normal). Just wondering what your experience is with HE and fans before I order one. I did install the 13/14 GT500 radiator cooling fan last month which is supposed to move a lot more air than the 07-12 fans, I would think that would help some.