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Impact of EIN on taxation
Your question mixes up different things.  Your LLC business type is determined by how you organize your business at the state level.  Separately, you can also elect to be treated in one of several different status for federal taxation. (Often this automatically changes your tax status at the state level too, but you need to check that with your state tax authority.) It is true that once you have an EIN, you can apply to be taxed as a C Corp or S Corp.  Whether or not that will result in tax savings will depend on the details of your business.  We won't be able to answer that for you.  You should get a professional advisor if you need help making that determination.