My 4.8 Went 15.2 with just headers
My 4.8 Went 15.2 with just headers
'02 GMC RCStepSide 4.8 , Thumpr Cam , 3200 Stall , OBX LTs , MSD Wires , TrueTrac , 4.10s , 3/5 Drop , bolt in traction bars by LSX Powersports , EFI Live tune by LSX Powersports
15.2 @ 90 , 2.3 60' (Only mods at this time , LTs)
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