Gas engine and Diesel of same specs.Pull the same.

You didn't answer the question.

Why do manufactures put silly things like DPF's and SCR's on their engines when all they have to do is run your tune? You say your tune is cleaner than a DPF equipped engine.

Your exact words: " Actually my truck is cleaner without the dpf then with."

If true, just apply for the EPA stamp and your a billionaire overnight!!!! Let us know how that goes. I would be very interested because I have never met a billionaire in my life.