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You guys with Long tube headers, what O2 sensors are you using? One of mine (Bosch brand rear O2 with rear-to-front adapters) is reading lazy after less than a year bring first installed. I'm running LG's Superpro headers with Cats and looking for a sensor that's very sensitive to help boost my cruising fuel economy.
I saw a thread in C5 Gen where a member used a new AC delco sensor that had holes instead of slits. he had kooks long tube headers and reported good results.