Here's what I KNOW based on my personal experience. First, I am in no way connected to Hellion, whatsoever. I just happen to live in Albuquerque, where Hellion is located.
After careful consideration I chose Turbo over SC even though the initial cost is significantly more. Once I decided to go turbo, I only pulled the trigger after getting one of the best tuners in the world to install it in his shop.
Installing a system like this is no joke. I would not have done it if it could not be done by guys with a trainload of experience. Chris Groves and his guys at Dyno Edge have to be on the short list in any conversation about the best tuners/horsepower makers in the world. Their reputation backs it up. They did a meticulous job of installing it...no shortcuts...it was done right.
During the process I met and talked to John Urist, the owner of Hellion at his shop. Hellion is LEGIT! The thing you take away from working with Groves and Urist is that its not about making a buck. Theses guys are driven to make the best product and getting it to function perfectly.
Like any project like this, I had a couple of issues. When I did, both Urist and Groves personally gave it their full attention and came up with solutions. Hellion and Dyno Edge are unbelievably GREAT!
I've had my Hellion system all summer, and it gets pretty hot in Albuquerque. I've made three long round trips from Albuquerque to El Paso (about 250 miles each way) on 100 degree days. After working with shiftpoints and the tune over the past couple of months it went on the dyno for what I considered to be a look at the final result. At 11.1 lbs of boost it made 745 hp and 784 lbs of torque.
Everyone is welcome to draw their own conclusions...but these are the facts and my humble opinions based on my personal experience.