Thread: 421 SD Bathtub intake
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Old 03-09-2021, 12:34 PM
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JSchmitz JSchmitz is offline
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Join Date: Jan 2000
Location: Union, MO
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Originally Posted by tom s View Post
Dyno numbers have been out for years.About 30 HP over a dual plane 800 CFM single 500plus HP engine.Tom
Got ya. That's impressive gain. Does this have some design improvements though?

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