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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I installed a flowmaster on my 02 and wasn't really impressed with the sound to much. There definately was no performance enhancement, so I'll go with the ever popular magnaflow.
I would just like to state that a single in, dual out magnaflow with echo tips sounds amazing. It's perfect. Even with MDS on. When it's in the V4 mode, it has a nice deep burbble, all the way through about 2,500 rpm and then after 4,000 rpm it just starts to wail real nice. The magnaflow basically amplifys what your truck sounds like stock, so it doesn't sound too altered or silly. The Flowmasters are most definitely louder than the Magnaflows though.
The Flowmasters do not sound good with the MDS in 4 cylinder mode. The Magnaflow does, but it's quieter. If you're looking for any sort of performance gain, then don't get a Flowmaster.