bank one up stream is the o2 in the rear manifold, you know the one that sorta blocks one spark plug. you need a o2 socket to remove it. its a 7/8 th's socket.
98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
bank one up stream is the o2 in the rear manifold, you know the one that sorta blocks one spark plug. you need a o2 socket to remove it. its a 7/8 th's socket.