Alcon, we took in our Traverse (2011, LT, AWD, 133K miles) yesterday to investigate a clunking noise in the left front area of the car and they came back with a laundry list of issues. They said the control arm bushings need to be replaced and the control arms (did not specify upper or lower or both), the sway bar needs replaced and all of the shocks and struts. The car has been throwing P0420 and P0430 codes for awhile. I think it is is the cats going out because we replaced all of the O2 sensors. They said those codes mean it needs to go to a Chevy dealer and have the pcm flashed. They quoted me 2900.00 to fix everything. Does this sound reasonable? I took it to a auto repair chain (Jensen Tire). Are these repairs something I can do by myself? I have some experience wrenching on cars, but have never done anything suspension related. We are on the fence if we should do the repairs or get rid of the car and get something newer with less miles. Any advice is appreciated. Thanks, Doug.