Has anyone changed from a Flowmaster to a Magnaflow? I have the F/M Super 40 SI/SO 3 inch (5.4L). The sound is nice on the outside, but a little too much "cab rumble" for my taste when I am sitting in traffic. I have ran the 50 Series SUV in the past (2007 5.4L), so I thought I would try the Super 40 this time around. Anyway, I am looking to get some feedback from anyone that has switched from a F/Master to a M/Flow (or even from a Mag to a Flow). I am going to try the 5x8x18 SI/SO 3 inch (#12249). Thanks in advance for any feedback from you guys/gals...Kool150

 

I love my Flowmaster Series 40 SI/SO, but I do know what you mean about the cab rumble; especially with my turndowns.

 

Flowmasters sound ok, but they rust out, and they rob low end torque! I know from experience, as well as hearing from many others experiences! I would recommend dynomax or magnaflow! Dynomax bullets sound really good for the cheap price!

 

im in the process of switching from Flow to Maggie. ive got an Original 40 right now. im gonna be putting on a 12" magnaflow in the next week. im just waiting for my friend to bring it over

 

i've went from flows to magnaflows 3 times, its always a good thing. much better sound and much more low end.

 

Yes im guilty of once having a flowmaster 40 as well. But hey it was my first muffler and I was learning! After that was the true dual dynomax bullets..., and now..., true dual straight pipes with an X-pipe, exiting in front of the right rear tire! Finally found what I love and im never going back!

 

I doubt i'll ever buy Magnaflow, unless I had a really open system like hi-flows and LTs. I prefer the sound of Flowmaster, but the quality & construction of Magnaflow.