Check out these dyno's from the skunk2 site... they show the gains the skunk2 70mm gives you with the Greddy kit. The first is just the exhaust and the second is the exhaust plus the stage1 turbo cams. 40hp over the kit without!
Skunk2 Mega Power R 70mm with Greddy Turbo Kit
Skunk2 Mega Power R 70mm plus K20 Stage 1 Turbo CAms with Greddy Turbo Kit
The powerband on this last one is incredibly smooth compared to the stock cams. No big dip for vtec.
Skunk2 Mega Power R 70mm with Greddy Turbo Kit
Skunk2 Mega Power R 70mm plus K20 Stage 1 Turbo CAms with Greddy Turbo Kit
The powerband on this last one is incredibly smooth compared to the stock cams. No big dip for vtec.