Q&A

No engine codes. Talked with a maganflow rep and let him listen and he denied hearing/feeling anything different. Forgot to mention that it gets better if I turn off the OD, not 100%, but still better.

The "no back pressure" seems about right. Especially when you step up the RPMs and it runs and sounds better.

Just a K&N High Flow air filter. As for the trans going into lockup too soon part. I claim ignorance on that part. My experience with vehicles tells me no, but then again Im not 100% certain. Im waiting on a reply from Magnaflow to see what thier take is. If they claim ignorance as well, I know they know that something is going on or there wouldnt be as many posts claiming the same problemas tere is, then I guess I might have to go back to the original exhaust system.

After further contact with Magnaflow here is the answer to my question about the sound and feel of the exhaust on my truck.

"The fuel economy mode which makes a 8cyl engine switch to 4 cyl is what is causing the drone you are experiencing. We don't have a "fix" for it as it is sound cause by what the engine is doing. What we have suggested before is to add a resonator or switch to a larger muffler to help absorb that sound. Some people have gone back to stock exhaust and customers with other manufacturers have turned that fuel saving mode off.

To explain in more specific detail is with the 8 cyl engine the sound waves from the engine detonations are close together. When it switches to that MDS or 4cyl those sound waves are doubling in distance apart. This wave pattern is what is causing the resonance you are hearing at certain RPM's. Dodge manufactured their exhaust to be restrictive to counter act this drone, which impacts performance. When you install an exhaust kit or a muffler that allows for better airflow, your performance will increase, but so will that sound that was dampened by the stock exhaust."

Nicholas Howe
magnaflow.com | @Magnaflow | FB/magnaflow
O: (949) 858-5900 ext 1120

What'cha think?

Sounds sensible to me. If dodges MDS is anything like Hondas' VCM-variable cylinder managment , then that would also explain why I thougt it was going into early lock-up , from your original description. Think you got your fix.

kyjoe-Ya, I pretty much run the truck with the overdrive off, which defeats the purpose of going to a highflow muffler, and a high airflow K&N filter for the supposed increase in the MPG's. Thinking about getting a Diablo Predator tuner to just turn off the MDS and then be able to leave the overdrive on, thus my MPG's should rise...so it's believed. However Im on a very restricted budget right at the moment so getting one of these tuners is out of the question at the moment. But it is what it is. Thanks for the reply though..Happy New Year.