Hey man that kind of stuff happens!, it could be worse. I drove to a car show a couple months ago with a for sale sign on my other car-(not the dart)- it got a lot of attention and multiple immediate phone calls while at the show. When I went to take off the exhaust seemed extremely loud yet staggered so it only sounded loud on one side. Sure enough the exhaust, which was done by midas was done poorly. Midas did a gasket collector fitting on one side and a compression fitting on the other, only instead of using the ford style donut gaskets they flared the pipe thinking that it would hold. Finally the fitting gave way, the collector flange slipped around the flare and embarrassed the hell out of us, I had no tools or straps with me so I got up under it and pushed the pipe up enough to get us home-(live less then a mile up the road, no biggie). As we were pulling out of the parking lot the whole pipe decided it wanted to fall off and be ran over not only were we embarrassed but it side swiped the kick panel and left a hell of a gash. I thought the pipe falling off was bad then it fell off and came out from under the car altogether, had to stop get out and lucky its a hatch back we stuck it in the car and took off.
Days later I took it to the local exhaust bada$$ in town, this guy does work on all the nicest, meanest cars in the high desert. He put a 3/4" flange on with a whole new pipe and also put in an equalizer/ H pipe. The work was sooo much better, definitely professional quality and only cost me 85 bucks out the door to boot!.
Shawn.