The stock cams and hotside were upgraded from the Evo VIII MR onwards to a slightly more aggressive cam set up and a 10.5T hotside.
The Evo VII and non-MR VIII will require uprated cams to achieve their full potential and even Evo VIII MRs and IXs can benefit from fitting more aggressive cams, although they aren't necessarily required for stage 1 especially on the IX with its MIVEC ability. The Evo VIII 260 struggles to reach over 360 bhp on its milder stock cams.
The fitting of the cams really goes hand in hand with fitting a larger hotside on the pre VIII MR models as the larger hotside allows the full impact of the more aggressive cams to be used.
Generally speaking, aftermarket cams with lower duration than 272 do not need uprated springs. However, extremely aggressive cams, such as the Piper range will need uprated springs due to their highly aggressive ramp rate.
it dnt tell me what i need to upgrade to ??