looking for a heavy duty street 727

wow the CRT looks like an awesome deal, defiantly better parts for the money! does anyone know the different between his prostreet and prorace kit?

street: https://www.coperacingtrans.com/product_info.php?cPath=21&products_id=28

race: https://www.coperacingtrans.com/product_info.php?cPath=21&products_id=32

thanks guys