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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 03-19-2013, 02:44 PM
BiggBoy BiggBoy is offline
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Default Performance from muffler?

I have a bunch of work done to my truck.

S&B intake
ARH headers
Trinity
Hemifever tune
85mm fast man (soon to be 87mm moe's)
Cutouts

I did a few dyno pulls with my cut outs open and closed.

I made more power on the top end with them open. But made much better torque below 3.5k with them shut.

I'm moderately happy with how it sounds right now with the headers and the stock muffler, but the shop I dyno'd at highly suggested I go with a less restrictive muffler, and I would see a decent gain.

I love loud exhaust (why I have the cutouts) but I work crazy hours and I can't be waking the neighbors at 3am.

I am thinking my best bet is to go with a 22" magnaflow. I know alot of people run the 24", but I think that may leave me wanting more.

Any suggestions or input?
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  #2  
Old 03-19-2013, 02:49 PM
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I would say the 18" or 22" also. Your thinkin is on. You have the cut outs for when you want it loud...so just get a nice tone, quiter muffler for cruisin and leavin early for work. It'll still sound good, then would you want it to be stupid loud then open the cut-outs.
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Old 03-19-2013, 06:38 PM
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The 18 will not bother your neighbors, nobody has complained about mine. I crawl out of the neighborhood at no more than 20 mph anyways, so it does not have a chance to bark.
Edit; What were the numbers? Can you post the dyno graphs?
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Last edited by S.C. Express; 03-19-2013 at 06:40 PM.
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Old 03-19-2013, 07:51 PM
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I'd like to see the dyno charts as well.

I have a 14" on mine and while it's not overly loud for me, it is fairly loud at startup. It's not loud at cruising rpm but accelerating it's fairly loud. I'd get at least an 18", probably the 22" like you said, for your application.
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Old 03-19-2013, 09:48 PM
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I dyno'd at 368hp. I don't have print outs, but I have a video on my phone.

22" it is. Thanks guys.
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Old 03-20-2013, 12:25 AM
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good choice, i have a 22" maggy myself... and nice dyno numbers too!!

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Old 03-20-2013, 10:55 AM
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What kind of Dyno was it? There are big variances between the several different kinds. 368 to the wheels is impressive. Time for some sticky wide tires to put it to the ground!
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Old 03-20-2013, 03:48 PM
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Dynojet. I'm hoping to get it to 400+ N/A. I'm happy considering I have very little money it it so far.
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Old 03-20-2013, 04:08 PM
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Dynojet's are pretty optimistic in terms of numbers, the reason for questioning is those numbers are pretty high without mods like cam/heads...that custom tuning is definitely helping out...
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Old 03-20-2013, 04:17 PM
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Quote:
Originally Posted by BiggBoy View Post
I dyno'd at 368hp. I don't have print outs, but I have a video on my phone.

22" it is. Thanks guys.
RWHP?

That impressive with the bolt/add ones you have.
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