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Oldsman's right, 99's already have the smaller starter, no EGR, and high impedance injectors.
HPTuners would be a good idea, but not required. You would need to swap to 310cc or 320cc injectors, adjustable fuel pressure regulator to lower the pressure to idle and run with the larger injectors, adjustable FMU to raise the pressure in boost, and a wideband to tune it all yourself. Just know one important thing, this is a very basic fuel setup and if you're planning on going any higher than 4-5psi, you'll need something to better control the injectors, and then it would be a much better idea to get ahold of HPTuners.
Check valves aren't necessary, the stock MAP sensor doesn't care if it sees boost, it'll just read it as 0 vacuum.
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