Any two pieces "designed" to have a connection to the stock mid exhaust sleeve clamp...should fit with minimal effort...which both the AWE and IE say they are designed to do or include/sell adapters for. The issue being "had" in the thread is either one of the pieces is outside manufacturing tolerances(possible)...or an install issue (more probable and most likely). Hopefully something like installing a AWD DP on a GTI is not what is playing out on here...
...only so many possibilities of wrong exist...causing whatever issues this is...
Considering the picture is of a late model mk5(stamped steel control arms, aluminum sub, and the rear LCA bushing design....) or mk6 GTI undercarriage...mk6 if you press me on a guess...I again...
...can only speculate....on how much general "understanding"exist of the issue they are having is.
But the should I just remove or run without the braces....should not be an "acceptable" answer or premise(IMO), but it's their car, and they are asking for internet wisdom...end of the day...they can do what they want.
They can either commit the time/money to fixing the issue, or ignore the problem and remove the braces, but if they are accepting the easy way solution of just removing them..."modding" in the future passed a simple stage 1 software tune should be a avoided...leave the car alone passed normal maintenance, but I'm just an NPC on the internet.