x-pipe and exit in front of rear tires?

When I put the X pipe on the Duster I got alot more low end torque. Vs.
the H pipe.
I put the x just behind the trans. Then used the 2 1/2 in. dumps from
Jegs. Put them in before the mufflers. This way when I go to the strip
all I have to do is open them up to run.
I still run a full exhaust to the bumper though.
Every mag has done a test on the diff. between the two setups.
The X pipe made more torque and HP.