Which exhaust yields the hemi better horsepower?

 

From my experiance, the free flow yields the most horsepower. However, on the low end there will be a torque loss.

I went with Magnaflow again but I was really eyeballing the Flowmaster 40 because I wanted to preserve some low end torque.

Turns out I didn't lose anything. I don't know if it's because I left the OEM resonators in each tailpipe.

 

I also went with the Magnaflo 3'' inlet to two 2.5 inch outlet swept side no duals. I also removed the resonator. It feels like I have no low end torque at all, but mid to top end is fine. I originally had a Gibson 3'' inlet and 3'' outlet with no resonator and it felt plenty powerful down low. In order to get more power down low, Do you guys think I should remove the muffler and go with a 3'' inlet and 3'' outlet muffler or go with my current set up 3'' inlet and 2.5'' but chambered muffler?

 

I'm pretty happy with my Mufflex and the Resonators. Doesn't seem like I lost much if anything down low.

Try a chambered muffler and see how that feels.