I think what thenoname means it that the strut brace towers on the Cusco are non adjustable and if you raise it with spacers, the angle will alter, even if slightly.
the OEM one, which allows for adjustment is probably more suited to the task.
this is prolly the main reason why i have stayed away from a plenum spacer because i have the GT Spec CF strut brace, again with no means of adjusting.
Don't know whether the non CF GT Spec one would work or the one from Summit.
Mind you, the non CF one from GT Spec allows you to seperate the bar from the mounting towers, so maybe thats a yes