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In 1987 Porsche experimented with a long-wheel-base 928 called the H50 that accommodated four doors and full-size rear seats. It was built on the then recently released S4 platform with the 330 bhp V8. Two different versions of the H50 were made, one as a station wagon and another as a hatchback. Porsche was pretty serious about testing the car and put it though 5000 miles of testing
Buchmann took a Porsche 928, removed all of the "unwanted" crap behind the doors and parts of the roof and created the stunning Buchmann Targa. This is a Targa convertible with an open roof above the seats but still with the B-pillar in tact. This opening is bridged by a Targa-bar which gives the car extra stiffness to compensate for the loss of it by removing the roof. The concept was a stunner.
Porsche 928 Long Wheelbase Specials
In collaboration with tuning company AMG, in 1986 Porsche created several long-wheelbase 928 specials. These models had normal 928 headlights until the Porsche 942. One was given as a gift to American Sunroof Corporation founder and CEO Heinz Prechter. The ASC was eventually part responsible for making Porsche 944 S2 cabriolets.
Porsche 928 Koenig
In the 1980s and 90s, the Munich-based tuning company Koenig Specials GmbH was known for its conversions of top-class sports cars, especially Ferraris. They also turned their attention to the Porsche 928 with a number of cool 928 kits. Popular in the Middle East, these "widebody" kits made the 928 look like a totally different car. It is unknown how many were made and most of the cars were pretty unique in terms of the kit and updates.
Not much is known about the Strosek 928 S4 Gullwing. All Strosek models were designed with body styling and aerodynamics in mind. As you can see from the images it is clearly the case for this 928.
Porsche shipped one of its experimental 'All-aluminum' 928S to the Brumos Racing Team for the 1984 24 hours of Daytona with the instructions not to modify the car in any way. Porsche desired to promote the performance of the 928 in the U.S. The drivers were given specific instructions to just 'drive the car'.
Porsche 942
The Porsche 942 was a special edition of 928 submitted by the company as a gift to Ferry Porsche on his 75th birthday in 1984. Also known by name 928-4, 928S, it had an additional 254 mm wheelbase than the normal 928 production model, including an extended roof over the rear seats to better accommodate tall passengers, headlights very advanced technology, the motor 5 liter 32 valves before introduced to the U.S. market.
The Max Moritz 'Semi Works' 928 GTR
Porsche's Racing Department never officially entered or prepared a racing 928 for a pure works entry. In order not to offend sensibilities of their traditional 911 customers by openly challenging them with a Works 928GTR offering, Porsche asked Max Moritz Racing, their longtime private racing partner from next door Reutlingen to enter a 928GTR Cup as a 'semi-works' car.