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In the end I believe that you will find both equally as good. Some dyno runs will be higher than others but in the end, they both reduced the amount of restriction and flow more air....
I went with the Halltech carbon fiber version strictly because I think it adds to the engine bay looks with functionality at no extra cost.
I was considering the Callaway modification, but appears to provide only 50 more hp for an extra $16k.....the cost to benefit ratio doesn't work.
When my warranty is past, DeWitts radiator (2x passes), lower thermostat and tune will be the way to go. The three above go hand in hand to getting lower engine temps but then they will void your warranty should something ker-plunk and should find a few more ponies....