in the process of rebuilding my rb25, the rebuild is costing me $6800 including engine out / in and tuning. this hasnt left me much change for aftermarket cams. my question is would an adjustable exhaust cam wheel on its own give much of a gain? im dropping cr from 9 to 1 to 8.5 to 1 so i can run more boost. at the moment im running gt30 500hp turbo with usual bolt on mods to get a power figure of 229 rwkws at 13psi and 260rwkws at 20psi. what sought of gains could i expect screwing in more boost say 22 to 24 psi with the 8.5 to 1 compression? exhaust cam wheel? what setting? any thoughts an ideas would be good?