These Hooker headers fit 1996-1998 Chevy/GMC 4WD 2500/3500 pickups (including crew cabs & Suburbans): 396-502 Tube Size 1.75" O.D., Collector Size 2.50" O.D., Collector Length 3", Port Shape: Same As Port; C.A.R.B. EO #D-164-5
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