  This article presents a collection of simulation studies using the ECCE
detector concept in the context of the EIC's exclusive, diffractive, and
tagging physics program, which aims to further explore the rich quark-gluon
structure of nucleons and nuclei. To successfully execute the program, ECCE
proposed to utilize the detecter system close to the beamline to ensure
exclusivity and tag ion beam/fragments for a particular reaction of interest.
Preliminary studies confirmed the proposed technology and design satisfy the
requirements. The projected physics impact results are based on the projected
detector performance from the simulation at 10 or 100 fb^-1 of integrated
luminosity. Additionally, a few insights on the potential 2nd Interaction
Region can (IR) were also documented which could serve as a guidepost for the
future development of a second EIC detector.
