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Re: Exhaust tube Diameter
At that power level you are getting close to the point where you need 3" duals, but 2.5" duals will support it if that's the route you choose. Use mandrel bends and good flowing mufflers. I'm at the same power level as you and went with 3" duals just so I know I don't have a restriction and have room to grow. They definitely are a little louder than 2.5", but muffler selection will have some to do with that as well.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread
'98 Camaro z28: 370ci twin turbo 370ci build
'01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD
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