Maserati might be the eccentric’s Ferrari to some but its canvas-roofed cars never lack performance.When Maserati brought its achingly pretty GranTursimo (GT) to market back in 2007 it was powered by a 4.2-litre V8, courtesy of sister brand Ferrari. Two years later, when the GrandCabrio arrived, it skipped the 4.2-litre treatment and received Maserati's 4.7-litre ‘S’-specification V8.To many, it remains the quintessential four-seater performance cabrio. Now Maserati is preparing a range of drivetrain upgrades for its GrandCabrio in anticipation of its public debut at the Geneva auto show. The 4.7-litre V8 gains eight kW to peak at 331kW and the six-speed ZF automatic transmission has been recalibrated with Maserati’s MC autoshift software to quicken responses. BETTER BRAKES, SHARPER ACCELERATIONBeyond the more dynamic drivetrain, the GranCabrio’s brake discs have been improved with grooved and drilled steel discs and the suspension benefits from revised active shock-absorbers.Maserati says its Skyhook active shocks make the GranCabrio Sport corner flatter when it needs to and ride with greater compliance over less-than-perfect roads.To distinguish the GranCabrio Sport from its lesser soft-top sibling, Maserati’s backed its Trident badge with a red accent, blackened out the grille, added revised headlights and enhanced airflow management with shapelier (and colour-coded) front corner splitters and skirts along the flanks.Maserati’s GranCarbio Sport is due to go on sale midway through 2011.