Do I need ARP head bolts for a 50trim upgrade.

[AJ]

They aren't mandatory, but as a safety feature you may want to do them. You can probably wait till you do a head gasket swap if you want. Otherwise do it all at the same time with your timing belt shit if needed. You should be good on a stock mitsu hg with copper spray.

I may be off here but for some of the other HGs you may need to have some machine work done.