I am not sure what 355mm equates to in inches, but I can tell you that the Brembo upgrade I did on my 97 GTS helped.
If you have a Viper with 17" wheels, you are limited to rotor size. Frankly, there are many good systems out there. Except for late model ABS, there is practically nothing that is going to work great. You may fix the fade issue, but Vipers are prone to front brake lockup regardless of what non ABS system you run.