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What's the difference between these chrome housings and the standard black housing versions

The higher the boost pressure

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COMP Cams Pushrod 9.350in Straight 7/16 8639-16 Intercoolers What's the difference between theseCOMP Cams Push Rods 8639 16 Pushrod, 9. 350" Straight 7 16 . 165 Wall 8639 16 Pushrod, 9. 350" Straight 7 16 . 165 Wall COMP Cams Pushrod 9. 350in Straight 7 16