i like my 845 motorsports downpipe, but i havent seen the Tork downpipe in person to compare either of them. but i am satisfied with mine and im sure there are people out there that have the tork down pipe and are satisfied.
the 845 pipe is a mandrel bend, 3inches, you would just need to tell them to put a 3inch flange on it instead of the 2.5inch flange. the Tork pipe is a pie cut design, i think they both look good and unique in both their own ways, Tork seems a little more into our small community, so that may be enough to make your decision for you.
When i got my 845 pipe, it was basically just on a whim to try it after looking at a ton of pictures. i was pretty lucky that it fits lol
just remember to use a lot of pb blaster when you are doing the turbo bolts though. i mean a lot...