It looks like Swiss tuner MANSORY is not going to miss any major auto saloon without premiering an exclusive tuning program. This time, at the Paris Motor Show, they will showcase the customized version Maserati GranTurismo and GranTurismo S.
As you can see the MANSORY Maserati GranTurismo comes with an extensive list on enhancements at both the exterior and the interior, some of which include a redesigned front spoiler with a carbon spoiler lip, a carbon fiber radiator grille, additional air inlets and outlets, deeper door sills, a carbon fiber diffuser, plus a new exhaust system that also makes use of carbon fiber at the exhaust tips.
The MANSORY Maserati GranTurismo also features 21 inch alloys wrapped in performance tyres and a progressive sport suspension that can lower the ride hight by around 30 mm.  
On the mechanical side the MANSORY Maserati GranTurismo which received an optimised ECU, a new air filter and a sports exhaust system is now able to produce an additional 30 HP from its V8 unit, bringing total output at 405 HP and 460 Nm of torque on the GT version or 440 HP and 490 Nm on the GTS.
The MANSORY Maserati GranTurismo price was not announced. 
Mansory press release :
MANSORY tweaks trident –
Exclusive tuning programme for Maserati GranTurismo and GranTurismo S.
MANSORY has long been known has the specialist for refining luxury automobiles. Now, the company from Brand in Bavaria has added an additional traditional brand to their tuning portfolio. The stylish and sporty conversion of the Maserati GranTurismo is once again proof of the fact that MANSORY has excellent know-how when it comes to customising Italian premium sports cars. Besides, the star, Emily, Flying B, leaping race horse, Bugatti oval and Aston wings, MANSORY products now also adorn sports cars with Neptune’s trident.
In the first instance, the eye is drawn to the striking MANSORY bodywork modifications: a newly designed front spoiler with discreet spoiler lip gives the front a significantly more sporty appearance, and the carbon fibre radiator grille highlights the famous Maserati trident in the centre of the grille. Additional air inlets and outlets enable the new light-construction bonnet to optimally regulate the temperature in the V8 engine compartment. The GranTurismo seems much closer to the tarmac thanks to the drawn-down deep door-sills. The carbon fibre spoiler lip at the back, the carbon inlay for the integrated exhaust pipes in the rear apron and a diffuser complete the sporty look. All add-on parts are made from carbon fibre and are manufactured by MANSORY using autoclave prepreg processing.
To ensure extra focus to the sporty add-on parts, MANSORY uses progressive sport suspension in the front and rear axles, which lower the vehicle’s centre of gravity by around 30 millimetres. Contact to the tarmac is maintained by 255/30 R 20 front tyres and 305/30 R 21 tyres at the back. MANSORY is the first manufacturer worldwide to market forged wheels exclusively for Maserati GranTurismo models. On request of the customer, these wheels are sprayed in the colour of the vehicle and decorated with black accents.
The Maserati GranTurismo and GranTurismo S also gain power under the bonnet, thanks to MANSORY. A performance-optimised ECU, an air filter with increased air throughput and a sports exhaust system with two double-suction tail pipes enhance the performance of the V8 aggregates by 30 HP each (series: GT 405 HP / GTS 440 HP). At the same time, the torque is increased by around 40 Nm compared to the series models (GT 460 Nm at 4750 / GTS 490 Nm at 4750).
The interior features MANSORY’s own brand of upholstery. The finest materials have been processed in traditional top-quality craftsmanship to add that individual touch to the inside of the MANSORY GranTurismo. The leather used by MANSORY for the interior is hard-wearing yet exceptionally soft. The chequered stitch in the ornamental seams on the inside makes for elegance as well as sportiness. Wherever you look: expert handcraft, individual design and top quality. The aluminium pedals and new ergonomically designed sporty steering wheel are additional visual highlights.