2011 Mazda 3/MazdaSpeed 3 suspension question

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02 Mazda P5
Posting for a friend. He has a 2011 mazda 3 and theres a guy on craigslist selling 2011 mazdaspeed springs. Is there a big difference in them and will they do good on a regular mazda 3. Would this drop the ride height.
 
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