Google search Max NA HP truck intake. According to the threads you will find the truck intake is capable of exceeding both your goals and mine. If you will never see 6k the truck intake is ideal. I shift at 6400 and the truck intake serves me well.
99 silverado 2500 4x4 ec lb, lq4 with 243 heads, pace setter long tubes, true duals with x pipe and bullet mufflers, comp 222 224 112 cam, 8.1 truck injectors, 4l80e with 2800 stall, 373 gears, 285 75 16 tires, efi live tune in progress, 350rwhp 360tq, 11.8 average mpg mixed driving