how much whp can gsr eagle rods withstand versus the Crower I beam billet rods. horsepower goal is 450-500. tried searching, but no luck. Also, with a 7 psi tial wastegate. Can I boost 25 psi with a Apexi AVCR. Or do I need a stiffer spring?

 

Eagle rods will be fine in that hp range if the tune is close.And yes the min. you can boost would be 7 psi.
Glenn