I believe I did have a great advantage at getting over the "600whp" mark at the time. I did choose to upgrade to a automotive 340 fuel pump and 1000cc injectors, with the cjm return lines. I think that alone gave me a high chance in achieving my goal of 550whp. I do also have a tomei titanium single exit exhaust. I don't know how much of a difference it would have against a dual setup. On top of that when it was getting tuned, the weather had a nice chill that day. Roughly 40-50 degrees maybe less, and then I had Jon Parhams awesome secret tuning skills.
So I kinda knew I was gonna get decent numbers at the time but I really wasn't expecting to hit over 600 on 9.5 psi at all, it blew my mind. Guess I was just lucky