... awfully direct for someone who is asking very simple questions that could be found with a search of the performance section. you adjust alda by removing it and placing shims under it, you adjust manifold pressure by creating a leak inbetween the waste gate and where you are getting manifold pressure from. either by using a tee with piece of hose on it with varying size hoses till you get the pressure you want or you by a controller that does it fo you.

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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car