You can reuse the o ring on the fprv or just get a new one from local autoparts store. Super easy job. I tried the shim kit first and ended up doing the race valve.
Hot Rod: 04 ECSB LLY LT 4X4: Built Motor, Built Trans w/ 1058, s472, 60% exergy, Wicked Level 3 CP3, Built Front End, Rancho 9000, Traction Bars
11.85 @ 115, 7.56 @ 92
Sold: Wife's Truck: 06 ECLB LBZ LT 4X4: Transgo Jr, 5" Exhaust, EFI Live by Bobo, Sleeves, Pump Rub Fix, PPE race valve, PPE airbox mod, Cognito braces, Edge CTS, AD ll 165, Bilstein 5100s, MagHytec rear diff cover, Alligator PCV reroute, SDP EGR Delete