Yes, I would agree with that. The internal resonance is definitely more noticeable. If someone is sensitive to that, I will put in a good word for the stock Ford resonator. It does it's job. Knowing what I know now, I wouldn't have removed it. The increase in internal resonance was not worth the very small increase in volume.
But, it looks good and sounds good. If I get tired of the drone, I'll probably swap the FM40 for a Magnaflow or some other brand of muffler, keep everything else the same. I like experimenting. Any suggestions?
The Flowmaster being a chambered design will be prone to resonance because there isn't any sound deadening material within the muffler. It's basically hollow and redirects the exhaust gasses a number of times through channels and chambers to tune the sound. It creates a very smooth, but boomy tone.
The Magnaflow Universal mufflers will definitely produce less drone due to their straight through design. Their design is simply a perforated core (pipe), wrapped tightly in steel wool and fiberglass acoustical fill, and packed inside the muffler case. It's a muffler in the truest sense of the word, it muffles the exhaust tone without altering it. Since there aren't any chambers or restrictions in the muffler, the freer flow alone will reduce vibration and resonance. The acoustical fill does its job to dampen any resonance in the exhaust system as well as reduce the sound level.
I like the Magnaflow options because they are basically endless. You can fine tune your sound and for us it's a completely predictable result in many cases. Selling exhaust and mufflers is difficult because of everyone's individual preferences and tolerance to drone. With a Magnaflow, the size and shape of the muffler will determine the final sound so we're able to point customers in the right direction. You have anything from their 4" round MAGNAPACK mufflers which will be aggressive and raspy, up to their truck/SUV mufflers which are the size of a kitchen trash can and will be whisper quiet.
If you enjoy the "Flowmaster Sound", you could also look at their larger offerings like the Super 50 or the 50 Series Delta Flow. Each will be noticeably quieter than the 40 series, both inside and out.
Sorry you asked?
