Well these headers are pretty small primaries. 1 5/8 in. so they make good torque down low but they lose some on the top end. For a 5.7 I would recommend a true 1 3/4in or 1 7/8in headers. The reason I went with the Ebay headers is that I was gonna get a turbo set-up anyways so I didnt wanna spend $1000-$1500 on headers



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