Since you already have the magnaflow I bet you'll like the sound with the header. Surprisingly silent at idle, during acceleration it growls with a deeper but kind of metallic sound if that makes any sense. You can hear the rap sound from the revs but it's not noisy at all, I love it!
The performance is great, idles so smooth, gets rid of the so-called CVT pause from the lowend and it plows when you punch the pedal. Nothing at all compared to the stock setup. Unfortunately I did this after my air intake mods which did a lot so it could be a combination of things. I can see that Dodge really choked up this cars performance with just the breathing alone.
Now that I know where I stand and what I'm able to push out of the car I might work on another whole new intake system.
7's should be no problem at all, without the headwinds, muggy weather and my baggage (toolbox, toolbag, work bucket w/ more tools, cooler and backpack) it'll happen. Just need to find a lucky day w/ no traffic.
As far as the header being worth the money for performance alone? It all depends, I like performance oriented cars, headers, nice engine bays, you get the drift. My friends and even the dealer is impressed with it all. I pondered on this header for the longest time and waited for posters which did not happen, My only regret is waiting this long to get it.
BTW, I'm lately getting 28-29 mpgs and Hawaii doesn't have any real highway driving plus I drive like everyone else, fast, nuts, slow, whatever...