JG EDELBROCK PRO-FLO 4-2-1 HEADERS

Up to 6 HP gains at the wheels! 3/8" laser-cut and CNC-machined flanges for a perfect fit 2-pc. design: 1-3/4" diam. "A" pipe and 2" "B" pipe Optional 3" "B" pipe for drag use Test proven on many 12-second, all-motor cars driven daily plus on 11-second naturally-aspirated track vehicles. Gains on a stock motor over the OEM exhaust manifold are 6 HP at the wheels while retaining stock cat-back exhaust. This header has supported over 250+ HP at the wheels when the optional race "B" pipe is used. NOTE: SKU numbers ending in F are factory shipped and may take a little longer to reach you.