As the last year of the C-5, rumor has it that the LS-6 motor will grace all C-5s in 03. It is almost certain (given only a 5 HP gain in a 5 year run), that the 03 Coupe and Vert will have the 385 HP version +/-, thus it would make sense that the Z06 be bumped up to 425 HP or so. Just my guesstimate.