I just ripped the factory exhaust off my 1992 f 350 dually's 460 and replaced it with a set of Heddman headers, "x" pipe, dual high flow converters, dual Dynomax super turbos and 2 1/2" pipes. Just got the truck back yesterday from the exhaust shop. At first she was very quiet and saw very little if no difference in power. After about an hour of showing it off to my buddies I noticed a MAJOR difference in both sound and power. Am I going nuts or did it just have to "break in"?

Also, It did stall while idling. My buddy and I were just talking and all of a sudden it loaded up and choked out. The check engine light used come on when coming off the highway and I noticed it came on later that night in my driveway too. I live in Rhode Island and emissions are pretty strict here so I made sure all the emissions crap was kept and re-connected.

Has any of you guys ever did a similar modification?
Has anyone ever ran into troubles after doing them?
Should I be concerned or do I just need to tweak things out a bit?

One last thing, the headers are very noisy both in and out of the cab. It sounds like an exhaust leak, you know, that "tapping" sound. You can't hear it at idle, just when you give it the gas. The exhaust shop said that it wasn't leaking just the sound of the air going through the pipes. Is he blowing smoke up my a..?

Thanks!!