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In a large pan. boil pasta according to package directions.
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Drain pasta and run under cold water.
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In a large bowl, mix together sour cream, salt, pepper, garlic powder, and celery powder.**NOTE Start by adding 8oz sour cream. If salad seems too dry add more. I used large bowtie pasts because I had it on hand and I think because of the size of the pasta, my salad needed 16 oz of sour cream.
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Add cooled pasta and mix well.
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When pasta is coated with sour cream mixtures, add Parmesan cheese and mix well.
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Cover and refrigerate at least 2 hours before serving.