Flowmaster Delta Flow 50 series?

[PHOENIX]

My choices for muffler are either:
Flowmaster Delta Flow 50 series
Flowmaster Delta Flow 70 series
Hooker Headers Aero Chamber

No matter which I pick its going to be 3" in and 3" out (one pipe all the way).

I emailed Hooker to see if the internals will burn up if too close to the cat like talked about before. If they dont, then its Aero Chamber for sure. Alot of you guys seem to like them and they are $25 cheaper then any of the flows I want.

But if the aero chambers will burn up (like Im thinking they will), then it will either be 50 or 70 series delta flows. What do you guys have to say about either of those? I dont want a lot of noise in the cab, and I want a deep, not loud sound, thats why I have choose 50 or 70 series. Just wanted to hear your opinions on the 2 flows.

Thanks.