The new BMW M4 convertible, seen here undergoing winter testing, could be revealed at the Geneva motor show
Power comes from a twin-turbocharged straight-six engine
The engine, which sees service in the new M3 and M4 coupe, produces 425bhp and 405lb ft
The adoption of a folding roof is thought to result in a weight penalty of some 230kg for the new M4 convertible
Cosmetic differences appear minimal between the new M4 convertible and coupé
The new BMW M4 Convertible is expected to cost around £61k
Test mules for the new BMW M4 convertible are shedding their disguise ahead of the car's official debut.
BMW's high-performance convertible, which is based on the recently revealed M4, is expected to be unveiled later this year. The relative lack of camouflage, however, suggests that the model may make its public debut as soon as March, at the Geneva motor show.
The new convertible will feature a twin-turbocharged six-cylinder 3.0-litre engine, producing 425bhp and 405lb ft; power will be sent to the rear wheels via a six-speed manual or seven-speed dual-clutch transmission.
Like the equivalent 4-series, the new M4 convertible features a folding hard top. This means the car will incur a weight penalty of around 230kg, compared to the M4 coupé, driving the kerb weight of the convertible up to around the 1770kg mark.
Barring the differences resulting from its folding roof, cosmetic changes from that of the fixed-roof M4 appear few. The M4 convertible, in these shots at least, retains the coupé's quad-exit exhaust system, rear lights and rear-end styling.
Official pricing is yet to be announced but the new M4 coupé costs from £56,635. The 4-series convertible commands a premium of £4.2k over its fixed-roof sibling, suggesting the M4 convertible will cost around £61k.
Read more about the new BMW M3 and M4.