A full bore magnetic flowmeter assembly, comprising: a tubular body having opposing open ends and defining a fluid flow path therebetween along a longitudinal axis Ax, the tubular body configured to attach inline within a fluid flow system, the tubular body defines a plurality of apertures spaced apart from each other; a pair of coil assemblies coupled to the tubular body in an intermediate region thereof, the pair of coil assemblies, each having a coil and a magnetic pole, are each disposed external to the tubular body on opposing sides of the tubular body aligned along an axis Az, the pair of coil assemblies are configured to generate a magnetic field within the fluid flow path of the tubular body; a brace that circumscribes the tubular body and that is operatively coupled to the pair of coil assemblies, serving as magnetic circuitry for the magnetic field generated; wherein each coil assembly further includes a first airgap shim sandwiched between the coil and the magnetic pole and a second airgap shim sandwiched between the coil and the brace; a pair of measuring electrodes attached to the tubular body, each measuring electrode of the pair of measuring electrodes coupled to a corresponding aperture of the plurality of apertures to be in electrical communication with the fluid within the flow path, the pair of measuring electrodes are aligned along an axis Ay orthogonal to the longitudinal axis Ax and orthogonal to the axis Az; and a plurality of auxiliary electrodes attached to the tubular body, including a first auxiliary electrode and a second auxiliary electrode that are disposed upstream of the pair of measuring electrodes, wherein the tubular body is a pipe which is selected having the same parameters of the adjoining pipe used in the fluid flow system. a tubular body having opposing open ends and defining a fluid flow path therebetween along a longitudinal axis Ax, the tubular body configured to attach inline within a fluid flow system, the tubular body defines a plurality of apertures spaced apart from each other; a pair of coil assemblies coupled to the tubular body in an intermediate region thereof, the pair of coil assemblies, each having a coil and a magnetic pole, are each disposed external to the tubular body on opposing sides of the tubular body aligned along an axis Az, the pair of coil assemblies are configured to generate a magnetic field within the fluid flow path of the tubular body; a brace that circumscribes the tubular body and that is operatively coupled to the pair of coil assemblies, serving as magnetic circuitry for the magnetic field generated; wherein each coil assembly further includes a first airgap shim sandwiched between the coil and the magnetic pole and a second airgap shim sandwiched between the coil and the brace; a pair of measuring electrodes attached to the tubular body, each measuring electrode of the pair of measuring electrodes coupled to a corresponding aperture of the plurality of apertures to be in electrical communication with the fluid within the flow path, the pair of measuring electrodes are aligned along an axis Ay orthogonal to the longitudinal axis Ax and orthogonal to the axis Az; and a plurality of auxiliary electrodes attached to the tubular body, including a first auxiliary electrode and a second auxiliary electrode that are disposed upstream of the pair of measuring electrodes, wherein the tubular body is a pipe which is selected having the same parameters of the adjoining pipe used in the fluid flow system.