The 4x4 manifolds are straight dumps. I lost the headers on my Jimmy and put on Corvette straight dump 2 1/2" manifolds. THis is the A ticket IMO. Several others have done same. You buy 63-64 manifolds, (I bought 2 drivers side as they were cheaper) and cut off the generator mount.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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