Cutouts for Strip only, beneficial?

Well, From my experience with an amatuer Style Annual Dragtrip Event in My Hometown, Everyone brought out their Street Strip Cars and the Local Bracket racers Mild to Wild brought out their cars without having to tow off to a a dragstrip 250 miles round trip, I would uncap my Headers on a BBC Single Carb , Hot Street motor for the Bracket racing day 1 , then recap my headers for the Street Cruise and Sock Hop at the local Mall with show cars etc . we would then run day 2 bracket eliminations all day on day 2. I have experienced 'noticeable performance gains' with Exhaust Back Pressure' All hooked collectors'.This annual Area wide Drag Race at our Airport Lasted i think 10 or so years until we got our own Track Built . I never went racing open Headers again after I Noticed this Performance Gain. The gains were improved take off response , Better Converter (2800) Results and more Crisp throttle response . wanted to share into your thoughts.