Well my current turbo is worn out. It has in-out shaft play as well as up-down. I've noticed max boost has been falling after nearly every run. I made several runs on 12-15-18, first pass max boost was 27psi, next two runs were 25psi. Then raced on saturday 1-5-19, max boost was 24psi. That's when i decided something must be wrong and gave the turbo shaft the wiggle test. Please explain the "quick spool valve". Thanks.