My old boss had a Ford 2005 6. 0, he did the edge juice and intake/exhaust, ended up blowing the engine and having it replaced under warranty around 30K miles. I think the repair bill was over $15000 that Ford had to pay. I can't say the Edge is what caused all the problems for sure, the engine is kind of flawed from the get go.
Oh yeah, it was pretty fast for a while when he had the Juice in there, I don't know the numbers but it would slam you back in the seat.