So your pedals clear? How is your heel clearance? Do you have any problems hitting the chamber with your heel, or worse, hooking on the silencer tip when pedaling?
I am asking because I have been planning this for a while, and this weekend I cut up my tecno estoril. I fitted it up and now the pedals clear as planned, but it looks like I will have this problem. I put my boot on the pedal and gave it a go around and It would definitely take some practice to remember to hold my heel out. The distances look about the same as your bike, about two pedal arms from the crank to the exhaust tip, and my foot is definitely longer than a pedal crank. Does yours just not stick out as far as it looks?
I was thinking about shortening the stinger anyway, maybe sinking some of it into the chamber. I will probably cut a third of the bend off first so the silencer curves around the swing arm and sits like this /, then maybe another third to try it like \ sticking out a bit past the rear wheel. Maybe even almost straight out kind of like a bi-turbo will look ok, but I think I might have to sink the stinger if I wanna maintain enough backpressure.