Originally Posted by
Whopity
Unless they are installed and listed in the Flight Manual, VFR only.
While that may be true for aircraft with standard airworthiness certification it does not apply to experimentals in USA. The limitations on IFR/IMC operation of FAA registered experimental aircraft are only those included in the "operating limitations" that are part of the experimental airworthiness certification.
My experimental is IFR and coupled LPV approach capable but has no FAA approved Flight Manual.