The engine must once again come apart and the fitment of steel con-rods and stronger pistons is now essential.. Coupled with all the modifications carried out up to stage 5 a hybrid Garrett T34 is now fitted with a Cosworth based exhaust housing. A custom exhaust is now required, and coupled with either a larger 5th injector or a 5th and 6th injector the boost is now raised to 25psi. The fitment of an uprated gearbox is now essential. At this level there are many additional minor modifications required to cope with the power but this can be advised at the time. Power levels are now at 300bhp.

taken from Karls site...he also says use a Stage THREE head, decent intercooler, cam, raised rev limiter,lightened and balanced bottom end, steel rods, T34, 25psi boost

so will a stage 3 head do the job or not??

bassboy