The G23 BMW 4 Series has surfaced on several occasions previously, initially on a transporter truck and then running tests at the Nurburgring Nordschleife. Our spy photographers have now spotted the G20 3 Series-based coupe once again, and this time we have a closer look, including at its interior.

Here, we can see that the dashboard architecture and indeed, most of the cabin appears almost identical to that of the G20 3 Series – and the G22 4 Series Convertible’s – even in the pattern of the front seat upholstery. The rear passenger cabin is slightly different, not least due to the coupe body, where the rear seats have a slightly different pattern in their leather trim seen here.

If powertrain on the G23 4 Series is signified by exterior kit, then this latest example seen here is likely a four-cylinder version, as opposed to the unit lapping the Nurburgring which was wearing Cerium Grey highlights on its side mirror covers and its wheels, along with the fitment of trapezoidal exhaust outlets; cues which signify the six-cylinder M340i model on the G20 sedan.

As such, the aforementioned example sighted at the German circuit could be an ‘M440i’, with xDrive all-wheel drive as featured on the M340i. This features a 3.0 litre turbocharged inline-six petrol engine with 374 hp and 500 Nm of torque, channelled to all fours via an eight-speed automatic gearbox.

More attainable and therefore likely to be the more popular options will be the four-cylinder variants, which will draw from the brand’s 2.0 litre turbocharged inline-four petrols in at least two states of tune. In their current forms, these yield 184 hp and 300 Nm of torque, or 258 hp and 400 Nm of torque, sent to the rear wheels as standard and possibly with all-wheel drive as an option.

Last but not least – how about that nose? The front end of this 4 Series coupe still wears some effective camouflage, although some cues are visible through the mesh covers. The rectangular mesh sections on the camouflage shroud reveal grille surrounds which visibly taper away diagonally towards the vertical, whereas the G20 3 Series grille stretches to meet the inboard edge of the headlamps.

This, then, could well draw from the grille design of the Concept 4. Should this front end materialise on the production G22/G23, it will probably be the furthest departure from the equivalent 3 Series, style-wise. What do you think of its application here? Does it work? Sound off in the comments section below.

GALLERY: G22 BMW 4 Series Convertible spyshots