I finally managed to get the exhaust mounted.
After some emails back and forth Paul from Metal Mule suggested to cut 5mm off the end of the small downpipe because the guys at Scorpion thought it might be to long.
I tried that but it didn't fix the issue.
But when I looked closer into the pipe I found this:
I contacted Paul and he confirmed that those 2 welds shouldn't be there so he advised me to file them off which I did.
So that fixed the issue I had and now I was able to mount the exhaust with about 2mm of play so it don't hits the frame
I don't have pictures yet of the exhaust mounted completely but here's one with the small downpipe not connected.
Looking good I guess