you should leave it on if you do not plan to modify fuel delivery.
back pressure is good for low end torque. which is ideal for a truck.
Yes...that is what we were discussing the other day on the other forum.
Exhaust length and diameter affects the power range of the motor. On a stock engine, large short pipes benefit top end power while killing off low end. BTW top end power is somewhere around where your stock cam and intake system run out of steam.
Colton, I have to admit I'm a bit blunt on this. It isn't my first rodeo with exhausts. On my old roadunner I used to add a piece of straight pipe behind the headers. By using heat crayons, I could determine the exact length of pipe to give me up to a .1 reduction in 60 ft times without affecting mph on the high end.
I also found that a 2.5 inch lead pipes run to two hemi turbos gave me another .03 on the 60 ft witout losing more than a couple mph through the traps...making worth while to run a rather quiet exhaust that I didn't need to remove to race.