I just noticed that as well.
I think they add a muffler instead of the resonator. Keeps the 'loud' down a bit.
Might help people like myself that bought the loudmoth and then added longtubes/cam. I am currently in the process of removing my loudmouth and trying to sell it. Car plain out doens't sound good to me. Idle is nice, but WOT sounds a bit rediculous.