I run the Cobb TBE, love the look, sound and quality of it. APS says in their directions that you have to grind the divider some to make it fit depending on turbo application. You want some type of bellmouth as it is the best flowing since there is no real "true" divorced setup out there. That lachute, if anything like your depiction, is next to being stock it looks like. The stock DP is a terrible design. I need to get a pic posted here so newer people know how bad it is, just too lazy, sorry about that.
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX