For some thirty years, the engineers at Germany’s TechArt have been enhancing the performance and styling of Porsche’s portfolio. Their latest effort is the Grand GT package for the new Panamera Sport Turismo that will have its world premiere at next month’s Geneva Motor Show.

It’s a full-scale tune that allows customers to pick and choose from a variety of individual styling and performance options, including the exterior paint, with the display model showcased in a custom Racing Green paint.

For a more aggressive stance, TechArt lowered the suspension and fitted the estate version of the Panamera with a wide body kit comprising of extended wheel arches, spoilers and vents, along with 22-inch Formula IV wheels, and carbon fiber exhaust tips.

Moving on to the interior, the German tuning haus covered almost every corner of the cabin in custom-designed Nappa leather with contrasting colored stitching, from the door panels, console and dashboard to the footwells and parts of the floor. The showcar also gets TechArt’s sport steering wheel, Alcantara roof line, and custom painted trims in body color.

A power tune that includes an ECU upgrade and a titanium sports exhaust system boosts the Panamera Turbo’s 4.0-liter V8 from 550PS (542hp) and 567 lb-ft (768Nm) to 640PS (631hp) and 664 lb-ft (900Nm). As a result, 0-100km/h (62mph) now takes 3.4 seconds instead of 3.8 seconds, while TechArt says that from this point, it only takes 8.3 seconds more to cross the 200km/h (124mph) line.

Joining the new Panamera Sport Turismo GrandGT at the German tuner’s stand in Geneva will be their offers for the 911 GT3, 911 R Cabriolet, 911 Turbo S, and the Macan SUV.