4"OD to 3.25" ID ReducerThis reducing insert adapts a 4" ID intake hose to a 3 1 4" OD tube (or throttle body). You install it in the end of the 4" rubber elbow or hump hose, and then the 3 1 4" intake tube fits in the hole. Actual ID is 3. 23", so it will be a snug fit and may require a little additional force to install. Made in USA. 40R323
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