does 04+ mazda3 tein springs fit 08 mazdaspeed3????

Fit? Yes. Good idea? No. Your mazdaspeed 3 is significantly heavier in the front end compared to the Mazda 3. Springs are designed with this in mind. Those teins won't have the strength for your application.
 
Cool. Let us know how it goes in the short and long term. A couple things I'd be on the look for is bottoming out your dampers, and the overall longevity of them. They'll be working extra hard, and possibly outside of their designed operating range. All dependent, of course, on the dampers you are using.
 

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