Or wait till rbarn tries it first, he staying stock exhaust for now as well.
Always open up the intake path on a twin screw blower before wasting money on exhaust. Kenne Bell has dyno graph after dyno graph proving this.
3.25 pulley will probably have too much belt slip. It'll be for later as well.
Realistically the stock crank should handle 800+ hp with a good set of rods and pistons. I'm worried about the pistons more than anything else.
and after an afternoon of driving mine the answer is HELL YES YOU WANT TO WHIPPLE.
1/2 throttle down shifts while cruising under 45mph feel like it did when you floored it pre-blower. Truck shoots off the line and sounds like you have jet engine under the hood. LUV IT.