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  #1  
Old 07-23-2009, 05:54 PM
stever stever is offline
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Angry problem with magnaflow muffler on 09 hemi

I just had a magna flow muffler installed on my ram 09 hemi ,but I have a problem according to my evic system my fuel economy just went in the gutter,it is about 3 to 4 miles to the (bad) on highway and city driving .I talked to my dodge dealer and they seem to think that the MDS system does not like the change and it is staying in the 8 cylinder mode..?
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Old 07-23-2009, 06:18 PM
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So can you tell if the MDS is going in and out?????
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Old 07-23-2009, 06:27 PM
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Default MDS

I am no expert but I do not think this is the problem. I run my truck in 5th gear all the time so the MDS does not kick in and my fuel economy goes up.
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Old 07-23-2009, 07:35 PM
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Lots of guys have added the Mufflex Magnaflow kit in various sizes and none have had any MPG issues. The MDS still works too so the muffler itself should not be the source of the problem. When mine kicks in, the MPGs go up dramatically.

What exactly did they do? Did they weld on your truck? If so, where did they place the ground wire and was the battery left connected?
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Last edited by topgun; 07-23-2009 at 07:48 PM.
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Old 07-23-2009, 07:57 PM
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Never heard of that before .
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Old 07-23-2009, 09:37 PM
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Default re: magnaflow problem

my truck does not have the indicator light for the mds sys. so I AM NOT SURE WHEN ITS IN 4 CYL MODE , there is a little 7 mile stretch of hwy that I take to and from work each day ,noting my evic mpg usually climb to about 19 or 20 mpg in that stretch , but now its no more than 15.1 , and less in the stop and go stuff.
also topgun ,I dont know where they grounded at when they welded on the magnaflow ,they did not un hook the battery...thanks for the help

Last edited by stever; 07-23-2009 at 09:47 PM.
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Old 07-24-2009, 12:15 PM
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I just installed an 18" magnaflow on my single piped 09. I took it out for a brief run on the highway and my MDS sounds like it is working. I can tell when it kicks in and out by watching the RPMs. They will jump ever so slightly when the MDS kicks in and drop a hair when all eight come to life. I can also tell by the sound, moreso now with the new exhaust.

I really like the Mufflex 18" kit. It took me about 45 min to install and is just the sound I was looking for. Any louder would be too much in cabin noise for my tastes.
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Old 07-24-2009, 07:38 PM
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Default magna flow follow up

I went back to the muffler place and had them remove the magnaflow and put my original muffler back on and now my evic mileage returned to normal, .go figure... (dual pipe exhaust )
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Old 07-25-2009, 10:40 AM
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Quote:
Originally Posted by stever View Post
I went back to the muffler place and had them remove the magnaflow and put my original muffler back on and now my evic mileage returned to normal, .go figure... (dual pipe exhaust )
So you are now back to a single exhaust and all is well?
Wow this is crazy but informative, I will stay away from exhaust mods of this type.
Glad you could get your sanity back but sorry it was at a cost to you.
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Old 07-25-2009, 10:44 AM
stever stever is offline
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Default re magnaflow

Quote:
Originally Posted by Mcguinness View Post
So you are now back to a single exhaust and all is well?
Wow this is crazy but informative, I will stay away from exhaust mods of this type.
Glad you could get your sanity back but sorry it was at a cost to you.
NO I am back to the dual exhaust,as it came on the truck.
I am thinking about a k&n filter or CAI ,BUT I AM NOT SURE THAT WONT SCREW UP THE MPG.....

Last edited by stever; 07-25-2009 at 10:48 AM.
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