P-K's Carey Paulino installs the dyno headers prior to testing on the Super Flow SF-901. Originally built for a 392-powered Dodge Challenger hot rod by Tubular Automotive (Rockland, Massachusetts), the primary tubes are 1-7/8 inches in diameter and 30 inches long with 3-1/2-inch outlets. Notice the Hot Heads 30-degree oil filter adapter (PN 21002), which places the Fram PH8A filter in the same position as the stock canister-style filter.