After a lot of testing I would stay with the stock box. What kind of boost are you running? The DCI will only benefit if you are running 1.2bar+. If you decide its a must have go for a cheap solution, the expensive ones are all about window dressing. I got the aFe and I regret getting it, was a waste.
All the DCI's have heat soak problems because they are exposed to the engine bay, it does get cooler as you go along. The Injen though due to the piping being metal will most probably suffer more than a plastic tube type.