Yessir, Jimbo...slip-ons. No tuning or otherwise modding them.
So far, no back-firing except during 'enthusiastic' engine braking...but then, I got that with the 2Bros, as well.
I'd say the claim to 'mount 'em and ride' is pretty darned credible.
Aren't they something? A little heavier than the 2Bros, but there's lots more to 'em than the cans I just removed.
Hope that helps ya, brother!