the Titan has an extra piece of pipe, really thats the only difference...and they were offering it for cheaper which brought the price down on the GMK...
you will have to cut a 3 inch hole for the intake, but after looking at some pics of people who've done it...it looks real easy. And coming from me, that means its real simple...
Also, with the GMK, they have apparently been installed on MTX's and ATX's without battery relocation, although it is recommended.
Not sure why there is an extra air breather tube on the intake but I think they give u a mini filter or something to plug that, not sure...
the thing about the GMK though is that he is creating them for each short ram setup...meaning not everyone is the same and is specific to injen, cta, etc.
And last, I'd have to disagree about the CAI not needed comment...of course there is pimp factor involved but the fact is that even though a nice heat shield will work, the filter is still in the engine bay which is no good. Get it out in the open if u want some real gains...
Man I'm talkin like I created this damn thing, who am I trying to sell?

But err yeah, just thought u guys might be interested...enjoy