i have a new 2009 dodge ram with the 5.7 and i put a maganflow 12198 and it sounds really wired when im around 25 to 30 mph like its missing or something. i don't know if i should put the stock one back on or what. if anyone knows anything please let me know.

 

hey chad. welcome to DF.

I have a feeling what you are hearing is the MDS. when 4 cylinders cut out aftermarket mufflers tend to make the exhaust sound kinda bad. i'll move this over to the 4th gen ram section, they should be able to give you more advise.

 

It's the MDS on the verge of just staying engaged. Almost sounds like its surging. I think its normal. I have a flowmaster 40 and it does it too. You just couldn't hear it with the stock muffler.

 

Nothing to worry about as the others said. You can do searches on this subject and ever since 2006 people who want a louder truck will say it comes at a cost of the strange MDS sound.

 

any audio of this?
id like to hear it.

 

yeah that happens to me too but there is nothing to worry about, just hit the gas and go about 3 miles faster and you wont hear it

 

I noticed a while back RGVram99 posted he purchased a Magnaflow part #12278 which is a 3" in and dual 2.25" outs. Now chadz is saying he installed part #12198 which is a 3" in and dual 2.5" out. Does anyone know which is correct. Im hoping the earlier one because thats what I ordered.

 

Anyone have any input?

 

the mufflex kit uses the 12278 but both should work

 

Or bop it into manual 5 and it should disengage the MDS....