375stinger

i have cmi split tube top headers with a single pipe riser. when i measure the hole at the end of the riser it measures 4inchs. would that mean this exhaust uses 4inch pipes? the other holes measure 1 7/8 where the exhaust leaves the engine. what would be the minimum sized exhaust for a 900hp 551 be? also, how much would these headers/risers/tail pipes for bravos, be worth a set? thanks

375stinger

hmn...actually, the center engine headers are 1 7/8, but the two rear engines are 2 1/8