Sadly, I was chatting with my service tech at the local dealer about Box mods in general. He said their exprience with their customers is one of general disappointment with things such as intakes, exhausts, chips etc.
Not to throw water on all this, it is just that I wish some of these after market parts makers would back up their claims with a money back guarantee.
If you say it is going to generate more HP, it seems to me that you should stand behind that claim!
Good luck with this!