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Magnaflow Exhuast

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From there, a high-flow catalytic converter and after-cat exhaust will get the gasses gone that much faster. You can run a 2½-inch system, but if you’ve already upgraded your intake side, you might find the engine has a big flat spot right off idle. A 2¼-inch system will avoid the flat spot problem, but won’t flow as well when cruising down the highway and won’t give as much power as the 2½-inch system either. Again, it is worth about 5-10hp.