GSX is far better in terms of a real racing approach. better times because of more traction. and the weight is negligable. a GSX wighs about the same as a spyder... i'm thinking of buying a GSX and parting everything on my spyder to it... oh ya, the 4g63 that's in the new EVO is the same 4g63 in all turbo eclipses, as well as a few n/t's, until they changed them to the 420a.