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There are a few videos in this thread.

https://www.coloradodiesel.org/threads/4-inch-exhaust.3377/#post-28201

I will make mention that the 4 inch is a custom job, that would have to get a muffler shop to do; no manufacturer makes one currently, only 3 inch systems are available. I think a 4 inch sounds a lot better per the video and I hope to do one some day. Those who make systems are aFe, Flo~Pro and now also, MBRP. aFe will be by far the best quality and probably hold up the best, but does cost more.

As for sound, I would say they all sound the same. Add a muffler or an exhaust tip and that will change your sound. I have the Flo~Pro with their muffler. It has some drone to it at highway speed but it’s alritht. I feel no muffler would be bad.
 

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I had a 4" MBRP on my LLY with straight pipe and no muffler. I loved that truck and the sound it produced. I wish this truck sounded like that. Like I said though, I don't know if I could handle the truck if I didn't have the muffler on it, I think it would be very annoying. With the muffler is alright. It's not terrible at highway speeds, just make sure the radio is on and don't focus on the truck and you'll be okay.

I am thinking of purchasing an MBRP or aFe tip in hopes that it will change the sound of the exhaust slightly and make it sound better. It's not loud enough for my liking at idle :cool:

It almost purrs at idle and doesn't sound like a diesel is why I say that.
 
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