After replacing the resonator and flex pipe, the noise from the exhaust is gone.

I'm now dealing with the check engine light from the fuel system, as noted on the "2007 hhr P0496 and P0171" thread. Dealer replaced the gas cap, and it goes in the shop Tuesday 1 PM to have the purge solenoid replaced.

 

Does any one know What kind of socket use on the bolt up to the manifold. It looks like asix star socket???