This should be a simple enough question (yet hard enough to stump me).
OK, my XLT has single in/single out factory exhaust system. Gibson has a single in/dual out exhaust called the super truck that is not made for heavy towing. Im guessing this is because of the loss of low end torque because of better flow. Now, if I were to put a dual in/dual out exhaust (still exiting out the side like the super truck) would I lose even more low end torque or would I gain horspower and torque. I dont completely understand the dynamics I guess. You guys with duals out the back should be able to help out on this one.

I know it will sound good but am concerned on towing power. Thanks!