Had the Flowmaster 50 series SI/DO installed today at a local muffler shop. Check it out!
https://www.f150online.com/galleries...w.cfm?num=6274

 

Looks GREAT!!!
This is likely the config I will go with also, except I would prefer some turn down at the tips.

So how does it sound? And does it feel any different?

 

Thanks. It sounds fantastic, much better than I expected. It actually startled me the first time I started it with the new muffler on.

I can't tell for sure if it feels any different. If it does, it's nothing drastic. Right now I'm still enjoying the sound. I'm sure my gas mileage is going to go down this month.

 

Do you hear any cabin droning ( resonating tone ) in the cab?
I have flows on my Cobra and the car just about vibrates at 2,000 rpm.

Love the sound of flowmasters!!

 

No drone that I can tell. Of course I've only had it on the highway once for about 15 miles since I got the Flowmaster. I could certainly hear it but it wasn't anything annoying.