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Old 09-07-2016, 06:50 PM   #31
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There was a noticeable difference in sound at idle, all the way up through part throttle and it's just a little louder on the hwy. At first I was concerned at how much louder it was, but compared to the factory level any increase is noticeable. I don't really notice any drone or anything on the hwy and when the mds kicks on around town it has a bit of a different sound...the good however outweighs the bad. I am getting nearly 1.5 mpg higher over the factory exhaust. Hand calculated over the last few tanks. Granted I calculated by hand the first 1k miles or so and have not done so again until installing the muffler. 27k on the clock now. I have yet to tow with it, I expect it will be more noticeable with 7k on the ball.

See this link for a video I found of before and after...in and out of the cab.

http://youtu.be/g_L9KdsMZOk



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Old 09-07-2016, 08:19 PM   #32
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There was a noticeable difference in sound at idle, all the way up through part throttle and it's just a little louder on the hwy. At first I was concerned at how much louder it was, but compared to the factory level any increase is noticeable. I don't really notice any drone or anything on the hwy and when the mds kicks on around town it has a bit of a different sound...the good however outweighs the bad. I am getting nearly 1.5 mpg higher over the factory exhaust. Hand calculated over the last few tanks. Granted I calculated by hand the first 1k miles or so and have not done so again until installing the muffler. 27k on the clock now. I have yet to tow with it, I expect it will be more noticeable with 7k on the ball.

See this link for a video I found of before and after...in and out of the cab.

http://youtu.be/g_L9KdsMZOk



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That helps a bunch! I showed this to the wife and she said it's not too bad! Maybe, just maybe I've convinced her, with your help. I'll take a 1.5 increase in MPG, that's just icing on the cake for me.

"Do or do not, there is no try" - Yoda
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Old 09-10-2016, 12:59 PM   #33
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Also....installed the magnaflow muffler in the truck last night and this am. What is a simple job turned into a battle with The provided crap clamps. Ended up going up to napa for 3.5" stainless band clamps. No leaks. Sounds like 6.4L should all the way up to part throttle. Not loud but you know there are some horses under the hood. The factory muffler has a valve (see photo) that diverts gasses through the chamber to keep the engine quiet up to part throttle. At full throttle the valve opens. Both factory and aftermarket then sound identical. Ram forums reporting 1-2 mpg increase by opening up the exhaust. Looks promising.Attachment 117098


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Do you think its possible to mod the stock muffler to get rid of the valve? I can't tell from the pic, but wonder if it would be possible to "gut" the valve out?
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Old 09-10-2016, 02:06 PM   #34
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Do you think its possible to mod the stock muffler to get rid of the valve? I can't tell from the pic, but wonder if it would be possible to "gut" the valve out?

Possibly. It's a ways into the muffler from the inlet...you might be able to knock it out with a long pry bar.


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Old 09-12-2016, 05:38 PM   #35
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Well, I modded the stock muffler. The flapper is about 18" in from the opening of the outlet side of the muffler.

I used my long prybar and 3lb sledge hammer to "bend" the pins to lock it in the "open" position. Free mod!

Butt dyno and ears notice no differences, but maybe after the computer learns the change I will report back any MPG increase. Currently my Lie-o-meter is reading 17.6 mpg avg. Not too bad IMO for mixed driving.

Offending Valve:



Prybar in action:



Final result:



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Old 09-12-2016, 05:41 PM   #36
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Nicely done!


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Old 09-15-2016, 10:22 PM   #37
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Are you guys seeing any power decrease. Love my 6.4 hemi. Coming up on 30k miles and it just keeps running better. Pulling a CC 29RE at 14k on weight.

I am running 3:73 gears and it pulls great. Zero issues on power. 6-9 mpg towing 15-16 empty.

Coming from a Ram 3500 SRW Cummins and the only think I miss is the turbo and exhaust break.

I've been debating messing with the exhaust but it runs really good on 87 octane right now.

Thanks,

Salt
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Old 09-17-2016, 07:17 AM   #38
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No. I'm at 28k and there has been no noticeable drop in power.


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Old 09-17-2016, 08:23 AM   #39
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Are you guys seeing any power decrease. Love my 6.4 hemi. Coming up on 30k miles and it just keeps running better. Pulling a CC 29RE at 14k on weight.

I am running 3:73 gears and it pulls great. Zero issues on power. 6-9 mpg towing 15-16 empty.

Coming from a Ram 3500 SRW Cummins and the only think I miss is the turbo and exhaust break.

I've been debating messing with the exhaust but it runs really good on 87 octane right now.

Thanks,

Salt
Mine is setup just like yours. I just turned 21k and I feel it's starting to tighten up and perform better. Stomp on the gas and that puppy roars to life!
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Old 09-17-2016, 09:43 AM   #40
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I want to put true duals and run an x pipe so bad I can't stand it. But and a big but, I don't want to lose any performance (hp/torque) or mpg. It's really running sweet the last 5k or so. I am hooked up to a trailer either the boat or 5er about 75% of the time.

The same with a CAI. The modding itch starts setting in.

I'd like a 40 gallon tank also...lol

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