If the resonator box thing doesn't work try check
www.MMRUSA.com they sale a air box that runs a tube into your wheel well and seals off to your hood it keeps the cold air in the hot air out I've heard good things about. I would try messing with the stock resonator box first. Also if you have your stock intake put that on and see if it still does it if it does then thats probley not the problem. good luck