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Not on a diesel. But I have their system on my 94 GT. I have the Ultra Flow SS system. Cat back. I've had it on the car for 2 years now. Love it.
As far as the diesel goes. I didn't think Dynomax made a DP for the PSD? A guy on "The Diesel Stop" had one of their systems but took it off because it was too loud for him? It was from the Cat back on his truck. He finally went with a MagnaFlow.
I just installed the DPPI 304 SS System with 4" DP on my truck. I quite happy with it. My only complaint would be the Clamp/hanger for the intermediate pipe. It was either them or Magna Flow for me. I think both systems are good.