I just had a new 3 inch cat put on my bird about a week ago. The thing is every since i left the shop here in phx, there was a slight rattle to my car. it was barely noticable when i left and sine then it has gotten worse. i havent had the time to lift the car to see anything but i just wanted to see if anyone had any ideas of what i should look for before i lift. it seems like it is coming from the driver side front when in the car and it sounds like under the driver side part of the car from under the hood. any ideas.

 

When I had my catco put on my v6 daily driver the heat shield rattled, I just took it off. You may look into that.

Also pm'd you.