The 2013 4.0 makes 235 hp to a stock SC'd 3.4's 270 hp. The 4.0 has 266 ft lbs of torque at 4000 RPMs compared to a SC'd 3.4's 270 ft lbs, but the 3.4's torque curve is flat and makes something like 90% of the peak torque at 1800 RPMs. That's without fuel system upgrades.Originally Posted by Crinale