problem is £££££,to rip out the internals and feplace with one off's cost to much,i know i can get the pistons,but the rest will have to be sourced,there is also an inherant problem with these engines and forced induction with the vvti,you need a stand alone ECU,which also costs big£££,the problem seems to be with higher boost levels the timing starts to get out of sync,and you get pre detonation!!!!!.........not v-good