4" or 5" exhaust - Chevy and GMC Duramax Diesel Forum
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post #1 of 14 (permalink) Old 10-27-2019, 10:12 PM Thread Starter
 
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4" or 5" exhaust

I am looking for a quiet exhaust. Videos I have watched are making me think the 5" with muffler is the most quiet option. (this is will be a delete btw) Anyone have experience with Aero mufflers? Would this give me a much more quiet exhaust?

Thanks!
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post #2 of 14 (permalink) Old 10-28-2019, 12:36 AM
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Generally speaking the larger the diameter the louder it is because people tend to use straight through mufflers with aftermarket pipes. If you want quiet you want to stick with stock.

If you just have to throw money at your exhaust then look for a muffler that has baffles inside, not straight through.
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post #3 of 14 (permalink) Old 10-28-2019, 02:37 PM
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4 is quieter than 5. I'd buy a straight pipe kit and install a 30" resonator instead of a kit with a muffler. FTE knocks out the drone and muffles.

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post #4 of 14 (permalink) Old 10-29-2019, 11:38 AM
J83
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Quote:
Originally Posted by mizterwizard View Post
Generally speaking the larger the diameter the louder it is because people tend to use straight through mufflers with aftermarket pipes. If you want quiet you want to stick with stock.

If you just have to throw money at your exhaust then look for a muffler that has baffles inside, not straight through.
As one of those people who owns a straight through muffler i can can confirm for you its not quiet.
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post #5 of 14 (permalink) Old 10-29-2019, 01:06 PM
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I deny everything - just "what I have heard"...….just "hypothetically speaking" if I did a "full delete", so that my DPF and CAT are now safely stored...……..I would chose 4" for the reasons stated in the above posts.

The exhaust kit that came with my "hypothetical" delete kit did have a muffler - standard "straight thru". Was fairly quiet, but not quiet enough. Had a ( again, hypothetical speaking.....!) 2nd "straight thru" muffler installed - much quieter - now almost as quiet as "stock". Yes, you could get it as quiet as stock, but then you'd have some back-pressure. I do not know if a modern big 4" truck muffler with baffles would add significantly to "back pressure" - guess whether it is significant would depend on what you use your truck for.
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2013 3500 long bed crew cab. Purchased at approx. 80,000; now have 91,000, convert to CP3. DPF "triggerd" a limp mode, so was cut out of the vehicle & cleaned by a DPF cleaning co., on re-installation, everything back to normal. Would never ever think of something as nasty and as anti bunny wabbet as a full-delete...after all..dosnt everyone like the fun & excitement of being stuck by the side of a Interstate in the ran while towing when one's truck's computer decides to go into "limp mode"...?.
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post #6 of 14 (permalink) Old 10-29-2019, 08:03 PM
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Ultimately you are unlikely to gain enough power from a large exhaust to make any difference other than maybe nosing out your buddy in his totally stock truck. As far as economy goes, it would never pay for itself in a lifetime of use.

Large exhausts work well on highly modified trucks making north of double the stock power and they give you something to bench race about but otherwise they have little value.

Here's some other ideas of thing you could do to your exhaust to make your truck stand out:

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post #7 of 14 (permalink) Old 10-29-2019, 11:02 PM
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Quiet exhaust with a 4” or 5” there’s no such animal.
Leave the stock cat go straight back open exhaust from the cat back add a 30” FTE resonator/muffler.
Less stink with the cat and less drone with the FTE, aftermarket cats like the Magnaflow does nothing to tone down the stinky exhaust.
4” or 5” back, at this point it won’t matter, 5” might have a little deeper tone.
Mine did with 5” filterless back exhaust with 6” vented tip, compared to 4” back with stock bugle looking tip.
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post #8 of 14 (permalink) Old 10-31-2019, 05:49 AM
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For the price, this 30" muffler is great quality and really quiets down a 4" straight pipe. It is a flow through design, but I can confirm that it took away all drone while cruising. I was very surprised out how much this quieted the truck down. I have never heard this muffler while towing though. For the price of $50, you can't beat it. I am pretty sure it is the exact same muffler MBRP sells for $150.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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post #9 of 14 (permalink) Old 10-31-2019, 01:12 PM
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Quote:
Originally Posted by eli_harper13 View Post
For the price, this 30" muffler is great quality and really quiets down a 4" straight pipe. It is a flow through design, but I can confirm that it took away all drone while cruising. I was very surprised out how much this quieted the truck down. I have never heard this muffler while towing though. For the price of $50, you can't beat it. I am pretty sure it is the exact same muffler MBRP sells for $150.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
That sure looks like what came with my MBRP kit.

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post #10 of 14 (permalink) Old 10-31-2019, 02:01 PM
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Originally Posted by J83 View Post
That sure looks like what came with my MBRP kit.
Seriously? lol. I was gonna order the MBRP muffler that was $150 but saw one review for it that stated they received an unmarked muffler that looked like the $50 one. So I took a gamble on it and I am glad I did. Truck is almost as quite as stock inside the cab. Not much louder than stock outside. $50 is much better than $150

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Last edited by eli_harper13; 10-31-2019 at 02:05 PM.
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