Boost gauage Air/Fuel meter EGT Gauge (exhaust gas temp) Fuel pressure guage Apex SuperAFC or equivelent (nice to have) J&S Ultra Safegaud (Timing computer / knock sensor) Upgraded injectors (nice to have for higher boost)
With all the listed items the 420a block should withstand a pretty good amount of boost even on stock internals. I myself am currently working towards this setup. Im just short an AFC and the Safeguard. And finally just a word of caution... I cant stress this enough, The FMU's we use were designed for no more than 9psi, unless you have the SuperFMU (adjustable). ~Because of dangerously high fuel pressures which can lead to injector lock up. + I would not want to depend on an FMU boosting 15psi...
