Are they the stock head pipes Sean,if so,they're only 2.25" to the 3" single.
I'd avoid dual 2.5" pipes,that's what mine are with the Magnaflow kit,and i honestly don't think the truck would spin the back tires on ice.
I lost a pile of torque under 4,000 rpm,truck pulls like gang busters after that for 287 cubes,but man waiting for it to get to 4,000 rpm takes forever,lol.
After 4,000 it puts a smile on my face though
Come this spring i'll probably put the stock pipe back on with a decent Magnaflow muffler instead of the Magnaflow dual exhuast kit.
Truck does sound really good though,wife loves it,lol