The physics are slightly better than the NTSC A version. There is less turbo scraping, and sometimes in the ntsca version, when you barely clip a wall you stop, but not so in the j version. Also, Icarus has 1 better steering ( awesome), and the Assegai has 1 more shield. Sometime the A version is faster depending on turbo scraping, and sometimes the j version is faster with the better turning of the Icarus. Also, it has two oval tracks, with superspeed