From the large long outlet cone to the long one that your fender support bracket goes across in the pic i count same amount on both pipes. Exact same pipe that i have.
I think youll like it better than the toomey!
For trails I'd say stick with a +2 or +3
And depending on what youve got for rear brakes youll need an extended brake cable or brake line! As well as a longer chain
Ive had zero troubles with mine backing out. I dont just tighten the nut i turn the screw in with the nut at the same time. it raises the idle just a tad bit but helps to make it tighter.