Bosch Motronic DME from my '86 n/a 944 with Autothority chip installed. Recently sold the car and the buyer wanted everything completely stock (even though I thought it felt better with the chip), so I put my stock DME back in. I had the stock exhaust, intake, etc and this DME/chip seemed to make the car run smoother and felt a bit more responsive/perkier. Asking $150, including shipping.
Here's a video of a few off-the-line runs and some spirited driving:
https://www.youtube.com/watch?v=p32xWimc0xU