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Porsche 944 Callaway (1983)
In 1983, American tuning company Callaway Cars began offering a turbocharged package for the US-Spec 944 in collaboration with Porsche. The standard 2.5 L inline-four engine was not suitable for forced induction because of the higher compression ratio of 9.5:1 which made the engine prone to failure when subject to forced induction along with the complex Bosch Motronic engine management system.
Porsche 944 Swiss Special (1984)
The Swiss Special 944 was a very limited edition 944 Special produced in 1984. Only 200 944 Swiss Specials were produced and it was largely a design exercise, with several upgrades to the normal 944. The changes included, Red-colored stickers on the back of "Porsche” “944", Special size teledial rims, Seats , rear bench and door panels in 924 Carrera GT fabric and dashboard plastic parts in black instead of the standard silver.
In spring of 1984 Rothmans cosmetic edition 944 was made, a batch of 100 numbered cars ordered by the French importer Sonauto (the subsidiary of Porsche AG) to celebrate the victorious Rothmans-sponsored Porsche 956 that had won Le Mans 24 hour race in France in 1982 and in 1983. At the time when the Rothmans 944 was sold, Rothmans-Porsche factory team decided to boycott the 1984 Le Mans race. Only 100 were produced. 
In 1988, Porsche introduced the 944 Turbo S with a more powerful engine (designation number M44/52) rated at a maximum power output of 250 PS (184 kW) at 6,000 rpm and 350 N⋅m (258 lb⋅ft) of torque at 4,000 rpm (the engine in the standard 944 Turbo generated 223 PS (164 kW) and 243 lb⋅ft (329 N⋅m)). This higher output was achieved by using a larger KKK K26-8 turbocharger housing and revised engine mapping to maximize boost for longer.
Porsche 944 Celebration Edition (1988)
The Porsche 944 Celebration Edition was a special edition of the 944 base model produced to commemorate the 100,000th 944 built in Neckarsulm, Germany. A total of 930 units were produced in one of two colors: Zermatt Silver and Satin Black Metallic. These celebration models- effectively standard cars brought up to a very high specification, featured black leatherette, the attractive grey or maroon "STUDIO" cloth and silver and grey carpeting. 
Porsche 944 S2 SE
The 944 range officially ended production in July 1991. A dated range and slow sales wrote the obituary for the model, but in the UK, brand-new cars still languished at dealers well into 1993. A UK-only special edition was made in 1992 and it was called the Porsche 944 S2 SE. It was  basically an S2 brought up to full specification, for less than the standard car. Very limited, only 15 were eventually made. Benefits listed include improved acceleration in higher rev range; flatter cornering due to stiffer springs and increased roll resistance...