With a 2001 F-350 with a 7.3, what do I HAVE to have to be legal with a DOT number in Iowa? I have a cat on there now. Can I strieght pipe it, or do I have to put a cat back on? I do not need a mufler with a diesel do I?
You should be alright, I removed both the cat and muffler with just a straight pipe, and it wasn't bad at all from the cab, not real sure what it sounded like roarin' down the road. I now have a full 4" with a big flow thru muffler and it doesn't sound much different, maybe a little better tone.
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