I discovered Ducatis in the late '80s and fell in love with the Darmah. Bought 2 basket cases and restored them. I take them out as much as possible, red line them, ride them as hard as I can and they are always a joy. Wait....not entirely true, they are Italian, so for every hour of great riding there's the 2 hours of tweaking after to get them to run just a good the next time. Pleasure and pain go hand in hand!
It is a Verlicchi race pipe. Glad you like the SSD. It is my favourite bike ever and I am lucky to own one. The engine was built by Brook Henry/VeeTwo in Freemantle, Australia about 8 years ago. Full race rebuild and it turned out wonderful. I really should video it one day and post the result on YouTube as it sounds amazing. I really need to take more photos of it too as I only have two and they are both really low rez. Next sunny day!! Meanwhile here is the other shot that I have. I've had the SSD since 1992 (the SD since 1996) so no excuse for having so few photos of them it's just that I'd rather ride than photograph.