The exhaust manifold? Huh? Just a cast iron thing with a heat-shield...You want one? (I think I still have 1-2 from when I built some "B" motors)
The actual rally cars were homologated under Group 4 I believe, and so had a tubular header.. That waste gate actuator looks impressive but let me tell you they were an enormous pain in the ass to set and it often could take 3-4 times and with the paper thing silicone rubber diaphragm inside, insanely easy to rip the rubber...It was such a relief when they finally moved to the nice ordinary waste gate actuators like these;
http://www.himni-racing.com/images/act%2018%20psi.jpg
If you're referring to the intake manifold, then that is just standard Saab 2,0 K-jet manifold..Quite long...Used on normal aspirated production cars (where its internal volume was a big bottle neck and limited n.a. power to right around 175hp--functioning much like todays accursed restrictors...but that was only a problem on Group 1 and 2 and later GpA cars..and extremely few ever bothered with the car in Gp1,2 or A)