What of are internals is and isn't forged? What would need forging if we wanted to up the boost of a f/i car(any sites to find these parts)? And how much psi on a f/i carwould a good guess be for a DD with forged internals? It might be worth it to do this in the long run for a f/i car cause a rebuild would cost more than forging and it's better safe than sorry.

Thanks ahead for any info!