I am in the processing of buying a S2 RST, at the moment its having the crank re-ground, new shells, new pistons and re-bore. Its got a Power Engineering cam, pace intercooler, k&n and full exhaust system. Running the standard T3 turbo.
Once it is run in, I am not sure of what boost to run, i would like it to peak at 18psi. Is this advisable?

One more question, what would you recommend the next engine modification to do???

Thanks,