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I am running full deletes with the factory pipe minus the cat. I didn't want the five inch the factory four does just fine with egts. But its not loud enough I left the muffler in place cause it's just straight threw . If I take that off would I notice a difference?
 

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Nope not really. Are you still running the factory downpipe?
 
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I think I've posted this like 3 different times in various threads but I found taking the factory muffler off mine made a nice difference. I didn't think it would either cuz of the people that have tried cat back exhaust systems, but without the the other garbage under there, I found that removing the muffler made a nice difference for me anyway. Note: all testing done with my own ears, and 100 percent of what I say could be bull. Lol but that's my opinion. Try it. It's cheap to do.

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I have a 5" flo pro TBE on mine with muffler, my buddy has same truck and mods, same exhaust but no muffler and his is louder.
 

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I think I've posted this like 3 different times in various threads but I found taking the factory muffler off mine made a nice difference. I didn't think it would either cuz of the people that have tried cat back exhaust systems, but without the the other garbage under there, I found that removing the muffler made a nice difference for me anyway. Note: all testing done with my own ears, and 100 percent of what I say could be bull. Lol but that's my opinion. Try it. It's cheap to do.

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Hmmm... Now who's talking with their hand over their mouth through their fingers??? :spank: <TEASING!>
 

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The VGT is the culprit as relates to the sound. My 5.9 without the VGT sounded great.
 

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Mine is 4" straight pipe with flo pro delete pipes and I cut the factory muffler out and welded in a piece of 4". Mine is stupid loud. Not to loud for me. But lots of people say it's too loud
 

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dont have a 4th gen but ive got flo pro 5" TBE without muffler and mine sounds great and its loud
 

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If you want it loud put a good turbo on there. My truck had 5" exhaust with the stock vgt and it was still really quiet and then I did my 2nd gen swap and that thing roars.
 

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I had 5 inch tbe no muffler on my 4th gen an it sounded great no where near as loud as my 07 5.9 I had that would set off car alarms if I drove past but it was loud enough


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I just a 4" down pipe and delete pipe and my truck still sounds horrible. Looking for ways to make this truck sound like a true Cummins. I hate to swap turbos but that might be what I have to do.
 

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I finally removed my stock resonator and it sounds a little louder, especially when you get on it. I love how it sounds. Still pretty quiet with the windows up.
 
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