Ottp 3" Cai
Senior Member
Joined: 03-12-07
Posts: 1,585
Likes: 1
From: Columbus, Ohio
i believe it is 2.75" as the coupler needed for the ls4 throttle body is 3" outer intake diameter to 3.5" outer throttle body diameter. the ls4 tb is about a 3" (75mm iirc) and the k&n is 2.75 or so
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