Ray,
thats some good info... Seeing how dual exhaust increases the overall volume of air flow from the cat back, I wonder why exhaust manufacturers don't compensate by reducing the size of the dual pipes so they optimize air flow over the entire RPM range. Especially for 4x4 trucks most of us want low end grunt and not high HP at high RPM's. It seems they should have dual exhaust that sound/look good and have smaller diameters so the low end torque is maintained, or they should shorten the pipe length and have the exhaust exit before the rear tires. I have actually seen some custom exhaust that exit before the rear tires and it looks great when done correctly.
To me it should'nt be necessary to put headers or a s/c on just so I can have dual exhaust, but hey who am I...
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