Do exhaust resonators rob horsepower?? - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 30 (permalink) Old 02-12-2020, 09:45 PM Thread Starter
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Do exhaust resonators rob horsepower??

I've been toying with the idea of getting an FTE resonator for awhile...
Watched this YouTube video and now I'm rethinking that decision. What say you guys?



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post #2 of 30 (permalink) Old 02-12-2020, 09:50 PM Thread Starter
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My bad... I meant to post this in 2nd gen but thats OK. I'm sure everyone will see it.

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post #3 of 30 (permalink) Old 02-12-2020, 10:50 PM
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Interesting. That looks super restricted, no wonder.

-2008 6.7l QCLB 4x4,g56,J-67(23ME),valair DD,64.5/72/14,2nd gen mani,arp 425's,boost and pyro... -1993 W250 CCLB...
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post #4 of 30 (permalink) Old 02-13-2020, 08:19 AM
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GOOD LORD -125HP on a mod truck difference .

Who knew , thanks for the info on the auger style resonator .
Super nice to get rid of drone , but ohh my what a price to pay .

PS. this was on a high flow mod truck flowing way more air than a more standard truck so keep that in mind .

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post #5 of 30 (permalink) Old 02-13-2020, 08:35 AM
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Iíve seen people on here claim this as well but find it hard to believe but who knows right. Thatís why I havenít got one yet either.


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post #6 of 30 (permalink) Old 02-13-2020, 09:53 AM
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Had a 5" diameter, 30" FTE resonator on my setup in front of a 51" Donaldson muffler, the FTE would produce a whistle-like noise under full acceleration. Just ditched it recently, noise is much better now with just the muffler.

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post #7 of 30 (permalink) Old 02-13-2020, 12:07 PM
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I'd like to see a similar test in a close to stock configuration. Running at 850+ HP requires extreme fueling along with a completely free flowing (maybe over-sized) intake and exhaust and a large turbo. At that power level, any bottleneck is going to dramatically cut power. For most of us running closer to stock, I doubt the exhaust restriction in a resonator is that big of a deal. Especially if combined with a high flow muffler and installed in place of the stock S-shaped muffler and a cat.
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post #8 of 30 (permalink) Old 02-13-2020, 05:42 PM
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I have the flo pro twister and I have to say it works very well at killing drone. When I went to a 5" Magnaflow tbe it was obnoxious and the drone would drive me crazy so I installed the twister. I am now thinking about ditching that now after seeing this and replacing it with a magnaflow muffler and see if I can lose the drone but still keep a little of the lovely sounds! I figured my compounds would make a muffler or resonator obsolete but that sure wasn't the case for my application! Does anyone have any experience with the magnaflow 12776 universal muffler?

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post #9 of 30 (permalink) Old 02-13-2020, 11:28 PM
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Just saw this last night as well. Shocking, but letís back off and be realistic for a moment: how many of us are trying to drive a 900hp 7.70 index truck?

Iím sure it robs a little power for us sub-600hp folks (and sub-400 like me on stock fuel and air) but I bet nowhere near as much as the factory DOC, DPF, and NOx do/did. And thatís also at WOT with max fueling. Iím betting at normal cruise (10-20% throttle) itís minimal impact.


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post #10 of 30 (permalink) Old 02-13-2020, 11:47 PM Thread Starter
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Obviously a mild HP engine is not going to see 120 HP reduction... Hopefully no one would believe that after watching the video.

But how much power will any engine loose with an FTE resonator is something no one can answer because no one has performed a with and without dyno comparison. Speculation and assumptions is kinda mute here.

And I would bet a dollar that before this video was ever made if anyone would have suggested they could loose considerable power by running an FTE resonator, the masses of members would jump in and respond with a "heck no." And why wouldnt they since FTE's own website says "This unique spiral design virtually eliminates the unwanted sound while keeping flow characteristics for both performance and EGT reduction." and "No gain in EGT or reduction in flow" so why would anyone ever think anything else??? There's no disclaimer saying...this only applies to engines under "X" horsepower.

I definitely do not know what the power loss would be for any engine running one of these resonators nor am I saying there would be any, and obviously cruising around town driving isnt the topic of discussion. But I can say that when I'm pulling my heavy trailers up long highway grades at WOT, I want everything that engine can offer. Until someone (preferably FTE) can prove there's no difference until certain HP levels, I think I'll just keep my truck as it is.

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post #11 of 30 (permalink) Old 02-14-2020, 06:45 AM
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Not quite a resonator, and made zero difference to noise out the tailpipe, but this little guy reduced my in cab drone from 1700-1900.

The local chipped, over valved & communist fail boys tell me they found no dyno difference with or without this "race muffler".

https://vibrantperformance.com/catal...a5dfbc6faa8bce

The 12v truck it went on is straight piped with a muffler in the engine bay.
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post #12 of 30 (permalink) Old 02-14-2020, 09:55 AM Thread Starter
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I'm actually surprised no one makes an exhaust wave generator for these trucks. There's plenty of room...

'01 2500 Sport 4x4 5spd w/Fastcoolers, Mag-Hytec, EZ, RV275's, 4" w/o muffler, South Bend, Steering brace, aFe, 2 lo kit, Isspro Boost, FP, and EGT on pillar, Westach Trans/Diff temp gauge in dash pod, Raptor 100 w/ 1/2" line, Pac Brake, Rancho 9000, 285's
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