I am thinking of either doing the Hellion turbo kit or the Whipple 2.9 kit on my 2011 GT500. I can't choose between these two. My goal is to have both power, reliability and efficiency. I'm looking for advice from people who have done one of the two on their car and what the results were? So advice on the pros and cons of either way would be appreciated. I'm looking to go between 700-750 WHP.