OEM is the way to go. Maybe something wasn't right the first time you used them? I know OEM was way better than the gaskets kooks gave me.
Current: 2009.5 SBM G8 GT, Premium Package, Sunroof, Pat G. ECM/TCM Tune, Roto-Fab 102mm CAI, LS7/LS3 MAF, Kooks 1 7/8" LT's, SOLO HFC's, SOLO Mach-Shorty Balanced Catback, SOLO 3.5" Tips, 19" Sport Package Wheels, GXP Steering Wheel, GXP Diffuser, Neondials, VG Sharkfin II, Debadged (Except Arrowheads), Hood-Vent Mod, Lower Grille Mod
Next: RCR Modified Intake Manifold, RCR Ported TB, Powerbond UDP, Suspension Upgrades