He guys I'm helping a buddy of mine with his 95 Supra TT, for some reason we can not keep the boost up. He can launch and in 1st gear it will hit ~15-16psi, then hit 2nd and it will go to 19psi where it should stay, but by 5K rpms the boost drops back down to 13-14psi? It continues this in the next 2 gear......will go to 19-20psi, then fall to 13-14psi. Why is the boost creeping back down? Does he need a stronger spring in the wastegate? Or does he just need a boost controller? Thanks for any help.