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After you install the charger and tune you need to get on a dyno and check your air/fuel. If it looks alright you are good to go. Mash on it all you want and you will be fine.
should i change my oil to synthetic? What gears should i change to? Right now I have 4.30's
You'll want to change your oil ever 3k miles no matter what oil. Your oil will get more contaminated due to the higher cylinder pressures(more blow-by). This is assuming you use that power.