The SS and BX are identical as far as design.
The only difference is...
The SS is Stainless Steel (obviously).
The SS also comes with removable baffles to reduce noise (You'll never use them, trust me)
The BX is Aluminized Steel (The welds and Tips are stainless though)
I have the BX becuse I live in rust-free Phoenix, Arizona
The BX is by no means a low quality product, it's just not stainless
Here is a pic I took prior to installation....
It sounds awesome!
I just switched out my Flows for my Bassani and I am so glad I did!
-Low muscle car rumble down low.
-Screams like an exotic race car at WOT.
-No Drone!
-Low interior noise; almost none while cruising.
-Very loud outside car.
-Produces more of a rumble instead of a hum.