Currently have a magnaflow from previous owner , Looking to replace cats and all , does it make sense to do a true dual setup at this point? Had a borla pro xs muffler Si/do on a 5.0 while back that sounded perfect. Like the borla sound, would like to stick with borla.

 

Does it make sense? Only if you think so. Does it do anything? Not really.
If you go duals run a X-pipe.
Borla is my favorite muffler also. I have the xr-1 on my 07.

When you do your cats you only need 2 magnaflow high flows to replace the 4 you have.

 

The mind is a beautiful thing, it can justify anything! I just ordered a complete Stainless Works exhaust system, headers w/cat and true duals out the rear of passenger tire from Stage 3 Motorsports they should be here in a week or so. My justification is I have the exhaust manifold leak that the 5.4's are known for.

 

If I remember correctly, the dual in/dual out ProXS has the X-pipe built in.

 

Yes it does