Its a set of pipes that go into your exhaust manifolds that inject air to cause the left over fuel that didn't combust in the cylinder to go off inside the exhaust manifold rather than dumping it straight out into the atmosphere
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)
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