Hell no it don't hurt it bud! :thumb: Your mileage goes down though. Cause it sounds better. Know what I'm sayin? And as for will it be too load ........???? You mean loud? That's a matter of preference, I just did mine, and I bet my neighbors think it's too loud, but I LOOOVE it.
It's only a matter of time before diesels will be required to go through emissions testing. The first thing will be a visual, removing the CAT that so many have done, will get you busted real quick, as well as no muffler. I would just get the Walker BTM muffler, they make a 3.5" and a 4" model. They are a straight shot design so it greatly improves airflow without being any louder than stock.
Just my .02
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