Im new to 1jz's. I myself dont have one Im asking for a friend. I was wondering what the stock psi is set at for the twins and what the max psi is about? I tried searching and got a few threads not exactly telling the stock and max psi. I even tried google and wikipedia. I found 18-22 psi is the max and even then there are reliability issues. So please if you could tell me stock twins psi and there max psi thatd be great.