Originally Posted by Gantman
Driver72, you will lose bottom end response if purely stock. Especially if your MDS is active. That is the main reason for the "POORLY" designed y-pipe. 4cylinder backpressure. Now if you deactivate your MDS by way of ERS or a tuner, then yes, a free flowing, true dual you shall benefit from.
This is true, I forgot about the MDS.
And yes, backpressure definitely helps with lower end torque, but hurts higher end horsepower.
A perfect example is Mustang's 5.0 liter engine.
In the GT it makes 390 lbs ft of torque.
But in the Boss 302 which has a freer flowing exhaust, and intake manifold, which gave it 24 more hp on the top end, losses 10 lbs ft of torque.
But again, I forgot about the MDS, taking away a bit of low end torque will mean the MDS will not work as often and cut into fuel economy too.
But I'm sure there is a solid 10-15 hp in the mid to upper range of the rpm to be had....this is my first pick up truck so I still often think in performance car mindset and not low end torque which nice for a 5800 lbs truck too.