If you have a recommendation please let me know what type of work you have had done there.
Nursing an injury and cannot (sorry not supposed to ) do some things myself at this time. Drs orders.
I'm looking for exhaust work to be done. Sounds like leak is near firewall.
Diagrams show a joint in that area.

 

I have had great service from Wills GM in Stoney Creek their on Hwy 8 , sounds like the flex pipe before the cat con, this should be a warrenty replacement under the emmissions as it is one piece to the cat con , but the dealer will access that depending on your milage.

 

Take a trip to Ajax and see Nate at Bob Myers. He services quite a number of cars from the Ontario Cobalt Club that live in the GTA and make the trip just for him. He has done work a few times on my HHR and is one of the best. He treats each car like his own.
( and he owns a Cobalt SS )

 

not sure how far you want to drive, but Addison dealership on Eglinton in Mississauga is where I go. All our vehicles have been bought there and serviced there. We know pretty much everyone at this place and one of the service advisors was our neighbour. Very clean and knowledgeable shop!