Does the 989 count? It's my blog so I am going to post it.

"The Four Door Porsche
Credit: UnknownType: ArticleLast Modified: 07-02-2004 11:19 PM
The 989 was intended to become first 4-door Porsche ever, having a true back seat. Plans were for it to be powered by a large 4.2 litre, all alloy, water cooled V8, and for it to be the successor to the 928. Not too far into the development, it was trashed, due to the extreme development costs and limited number of potential buyers.The control arm suspension, which was later featured on the 993, was developed for the 989. The most striking feature are the headlight and tailight clusters, which are exactly like the ones found on the latest 911, the 996. Porsche had this 1998 styling developed all the way back in 1991! Even though the project was scrapped, it was not a total loss, as it eventually served as the predecessor for the 1998 evolution of the 911 nameplate. Try to imagine the side photo of the 989 with only one set of doors, and you'll see a striking resemblance to the 996. "