I have them on my car and they fit. I laid them side by side with a DSE header. They are nearly identical. There were a couple of bends on the DSE header that weren't as tight and may flow marginally better. Quality wise they are a nice part. I sold my DSE headers only after making sure the Holley fit.
Another benefit is that the collector is straight and doesn't have the angled Vband that DSE uses. I have the Holley blackheard header back exhaust that is designed to work with the quadra link. Everything fit with no cutting. The only cuts I made to the entire system were on the tailpipes so they didn't stick out below the rear valance.
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Jason Mitchell
1971 Camaro 416 LT1 Project
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