Like swims referred to there are two 10 series from flowmaster. The regular flowmaster 10's are aluminized not stainless, they are classified under their race category. The super 10's are stainless and still classified under their street category, they are also available in si/do configs unlike the regular 10. They came out in march iirc.
Id go with Cherry bomb extremes imo, they are very similar in construction to the flo 10's and are cheaper, you dont have to pay for that flowmaster name. If you are up north and rust is a concern then i might go with the super 10 because its stainless.