  The recent ATLAS and CMS diphoton resonance excesses are explored in a simple
$U(1)$ gauge theory extension of the Standard Model where the resonance is the
Higgs boson of the $U(1)$ symmetry breaking, $\phi$. This particle couples to
exotic quarks which, through loops, can produce a large enough rate to explain
the excess. Due to the choice of $U(1)$ charges, flavor constraints are
naturally suppressed, allowing arbitrary flavor violation in the decays of the
new quarks to up-type quarks, modifying their signal topologies. An additional
heavy quark in the model decays to the lighter exotic quark by emitting either
$\phi$ or the $U(1)$ gauge boson, $A_x$, giving extra signals containing
diphoton and digluon resonances. Finally, the new Higgs can decay into $\gamma
A_x$ and $Z A_x$, followed by $A_x$ decaying into Standard Model fermions
through kinetic mixing. Thus, this model gives interesting modified signals to
the general class of exotic quark models explaining the diphoton resonance.
