2004 Avv 5.3 with Radix....about 10-12k miles since install. All of a sudden I'm down from 6.5lbs, 330rwhp & 374 torq to 3.5-4lbs, 285 rwhp & 330 torq. No blow-by or leaks. No probs with waste gate that I can see, celenoid seems to be operating prop...